• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
LeadershipPentagon

Trump Says Patrick Shanahan Takes Over at Defense From James Mattis on Jan. 1

By
Bloomberg
Bloomberg
Down Arrow Button Icon
By
Bloomberg
Bloomberg
Down Arrow Button Icon
December 23, 2018, 12:14 PM ET

President Donald Trump will replace outgoing Defense Secretary James Mattis with his top deputy, Patrick Shanahan, from Jan. 1, ending the former general’s tenure two months before his planned exit from the Pentagon.

The abrupt move to cut short Mattis’s tenure was announced Sunday by Trump in a tweet. It follows waves of criticism over the president’s abrupt change of course on Syria and Afghanistan, which has fueled a sense of turmoil at the highest level of the president’s national security team.

Mattis announced his resignation on Thursday in a letter underscoring his policy differences with the president but saying he’d stay on the job until Feb. 28. The retired Marine Corps general quit after Trump announced his plans to withdraw U.S. troops from Syria.

The interim replacement for Mattis is a former Boeing Co. executive who joined the administration in 2017, reinforcing ties between the Defense Department and the Chicago-based defense contractor. Shanahan will serve in an acting capacity until the president nominates a permanent replacement who is confirmed by the Senate.

“Patrick has a long list of accomplishments while serving as Deputy, & previously Boeing,” Trump tweeted. “He will be great!”

I am pleased to announce that our very talented Deputy Secretary of Defense, Patrick Shanahan, will assume the title of Acting Secretary of Defense starting January 1, 2019. Patrick has a long list of accomplishments while serving as Deputy, & previously Boeing. He will be great!

— Donald J. Trump (@realDonaldTrump) December 23, 2018

In his two-page letter dated Dec. 20, Mattis laid bare his disagreements with the commander-in-chief. He criticized the president’s treatment of longtime U.S. allies and implied that Trump’s approach to strategic rivals Russia and China has been ambiguous.

Be Resolute

“We must be resolute and unambiguous in our approach to those countries whose strategic interests are increasingly in tension with ours,” Mattis wrote. He said it’s clear China and Russia “want to shape a world consistent with their authoritarian model” and said the U.S. must respond by using all of the tools of its power — including those alliances — as a counterweight.

Mattis also said the president was entitled to a defense secretary who shared his views and offered to stay on the job until Trump could nominate a successor who could be confirmed by the Senate.

But Mattis’ departure and Trump’s announcements about withdrawing troops from Syria and Afghanistan touched off criticism from allies abroad and from those within his own Republican Party. They expressed concern it could allow terrorist groups to regroup while allowing a freer hand in Syria to Iran, Russia and forces loyal to Syrian President Bashar Al-Assad.

Trump Defense

Trump defended his actions in a tweet on Saturday, saying he and Mattis has an “interesting relationship” and “allies are very important-but not when they take advantage of U.S.”

Brett McGurk, the U.S. envoy to the global coalition fighting Islamic State and an Obama administration holdover, followed Mattis in resigning. Trump tweeted Saturday that McGurk, “who I do not know,” was supposed to leave in February but “just resigned prior to leaving. Grandstander?”

While Shanahan has pledged to recuse himself from Boeing decisions, the defense secretary makes many decisions with a direct or indirect effect on the No. 2 defense contractor and its competitors.

Late Republican Senator John McCain expressed concern about such conflicts during Shanahan’s confirmation hearing for deputy secretary.

Among the immediate decisions that Shanahan may face is whether to accept delivery of Boeing’s new aerial tanker, despite the aircraft’s unresolved flaws. Mattis once vowed not to accept the plane if it’s flawed.

About the Author
By Bloomberg
See full bioRight Arrow Button Icon

Latest in Leadership

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Fortune Secondary Logo
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • World's Most Admired Companies
  • See All Rankings
  • Lists Calendar
Sections
  • Finance
  • Fortune Crypto
  • Features
  • Leadership
  • Health
  • Commentary
  • Success
  • Retail
  • Mpw
  • Tech
  • Lifestyle
  • CEO Initiative
  • Asia
  • Politics
  • Conferences
  • Europe
  • Newsletters
  • Personal Finance
  • Environment
  • Magazine
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
  • Group Subscriptions
About Us
  • About Us
  • Lists Calendar
  • Press Center
  • Work At Fortune
  • Terms And Conditions
  • Site Map
  • About Us
  • Lists Calendar
  • Press Center
  • Work At Fortune
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

Latest in Leadership

Gen Z in city
SuccessGen Z
Gen Z graduates’ best shot at good pay and homeownership isn’t in New York or L.A.—it’s Omaha and Dallas
By Emma BurleighApril 22, 2026
56 minutes ago
Elon Musk
SuccessEducation
Elon Musk thinks college is ‘basically for fun’—but his former Tesla HR chief tells Gen Z even their liberal arts degrees are more valuable than ever
By Preston ForeApril 22, 2026
1 hour ago
Capcom, Virgin Voyages bet on AI to reshape gaming and cruise travel
NewslettersCIO Intelligence
Capcom, Virgin Voyages bet on AI to reshape gaming and cruise travel
By John KellApril 22, 2026
1 hour ago
Steve Jobs called Tim Cook ‘not a product person,’ but still hand-picked him to run Apple and turn it into a $4 trillion tech giant
C-SuiteTech
Steve Jobs called Tim Cook ‘not a product person,’ but still hand-picked him to run Apple and turn it into a $4 trillion tech giant
By Marco Quiroz-GutierrezApril 22, 2026
2 hours ago
ravi
AICommentary
The $6 trillion reinvention: Why IT services firms must start underwriting outcomes
By Ravi Kumar S and Andreea RobertsApril 22, 2026
4 hours ago
Stephen and Ayesha Curry are coming for the sports drink market—and their kids were the first focus group
C-SuiteFinance
Stephen and Ayesha Curry are coming for the sports drink market—and their kids were the first focus group
By Sheryl EstradaApril 22, 2026
4 hours ago

Most Popular

The tables have turned: Florida and Texas are the biggest losers in the housing market as Ohio emerges a surprise winner
Real Estate
The tables have turned: Florida and Texas are the biggest losers in the housing market as Ohio emerges a surprise winner
By Sydney LakeApril 21, 2026
22 hours ago
'Something sinister could be happening': FBI looks into dead or missing nuclear and space defense scientists tied to NASA, Blue Origin, and SpaceX
Politics
'Something sinister could be happening': FBI looks into dead or missing nuclear and space defense scientists tied to NASA, Blue Origin, and SpaceX
By Catherina GioinoApril 21, 2026
21 hours ago
$166 billion in tariff refunds just became available, but small businesses may already be at a disadvantage
Law
$166 billion in tariff refunds just became available, but small businesses may already be at a disadvantage
By Sasha RogelbergApril 20, 2026
2 days ago
Jeff Bezos once gave Eva Longoria and the admiral behind Osama bin Laden's capture $100 million—but she says you don't need wealth to give back
Success
Jeff Bezos once gave Eva Longoria and the admiral behind Osama bin Laden's capture $100 million—but she says you don't need wealth to give back
By Orianna Rosa RoyleApril 21, 2026
1 day ago
John Ternus, the man stepping into Tim Cook and Steve Jobs' shoes, is a 25-year Apple veteran with zero LinkedIn posts
C-Suite
John Ternus, the man stepping into Tim Cook and Steve Jobs' shoes, is a 25-year Apple veteran with zero LinkedIn posts
By Kelvin Chan and The Associated PressApril 21, 2026
24 hours ago
‘Something sinister’: What we know about the FBI probe into dead and missing scientists linked to space and military industries
Economy
‘Something sinister’: What we know about the FBI probe into dead and missing scientists linked to space and military industries
By Jim EdwardsApril 22, 2026
6 hours ago

© 2026 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.