Not everybody is a fan of Republican presidential candidate Donald Trump’s hallmarking immigration control policy—namely, his proposed wall between the U.S. and Mexico.
Now, Jerry Brown, governor of the state with the most Mexican immigrants, has reportedly joined the team.
Brown, the Democratic governor of California told Bloomberg that Trump’s proposal to build a wall between the U.S. and Mexico and force the latter to finance it would be “absolutely preposterous.”
“It would create such tension with our closest neighbor that, probably, a dumber idea I can’t imagine,” Brown, who has been in office since 2011, continued. “It’s dumber than it is dangerous.”
The majority of Mexican immigrants headed for the U.S. migrate to California—about 37%, vs. the second-most popular state, Texas, which sees 21%, according to the Migration Policy Institute.
California has also been considered a final battleground for Republican presidential candidates hoping to keep the real estate mogul away from the party nomination ahead of the June 7 primary.
Brown is not the only one to air concerns about the idea.
Former Mexican president Vicente Fox recently nixed Trump’s wall idea and budget proposal with an emphatic and expletive-ridden “no.” Former Texas Gov. Rick Perry also dismissed the idea. Perry was also a presidential candidate at the time, according to CNN.
Brown, who has run for president three times, was also governor of California from 1975 to 1983.
When asked whether he’d be interested in a vice president position, Brown responded, “not particularly… I ran for president, not vice president.”
Fortune has reached out to Gov. Brown’s office and Donald Trump’s campaign and will update this story if they respond.