“I live in a border state,” writes Bush. “I appreciate the need to enforce and protect our international boundaries, but this zero-tolerance policy is cruel. It is immoral. And it breaks my heart.”

Bush continued to condemn the practice of warehousing children and constructing tent cities for their detention, comparing this practice to the Japanese American internment camps of World War II, “now considered to have been one of the most shameful episodes in U.S. history.”

The separation of thousands of families at the country’s border began with Attorney General Jeff Sessions’s announcement of a “zero-tolerance” policy this spring. Families arriving at the border anywhere outside of designated ports are declared criminals; parents are taken into custody and the children removed. The number of children being held by the Department of Heath and Human Services (HHS) has reportedly reached 11,500, forcing the construction of mass detention centers and launching a “mental health crisis.”

President Trump continues to falsely blame Democrats for these actions, despite the fact that there is no U.S. law that requires the separation of families and senators on both sides of the aisle have spoken out against the “zero-tolerance” policy.

It is the Democrats fault for being weak and ineffective with Boarder Security and Crime. Tell them to start thinking about the people devastated by Crime coming from illegal immigration. Change the laws!

— Donald J. Trump (@realDonaldTrump) June 18, 2018

Following Bush’s remarks, First Lady Melania Trump also shared her thoughts on the issue in a statement issued on Sunday. “Mrs. Trump hates to see children separated from their families and hopes both sides of the aisle can finally come together to achieve successful immigration reform,” said her communications director, Stephanie Grisham. “She believes we need to be a country that follows all laws, but also a country that governs with heart.”

In addition, in a rare rebuke by a former president, Bill Clinton also spoke out against the Trump Administration’s family separation policy on Sunday, tweeting “These children should not be a negotiating tool.”

On this Father’s Day I’m thinking of the thousands of children separated from their parents at the border. These children should not be a negotiating tool. And reuniting them with their families would reaffirm America’s belief in & support for all parents who love their children.

— Bill Clinton (@BillClinton) June 17, 2018

Legislation is already in the works to bar the actions resulting from the “zero-tolerance” policy. Senator Dianne Feinstein (D-CA) has collected 43 Democratic sponsors for a bill titled “Keep Families Together Act,” which will halt the separation of families at the border. She is seeking Republican support.

UPDATE: 43 senators now support our bill to bar children from being taken from their parents at the border. We still need a Republican senator to join. If you’re represented by a Republican senator, please ask them to cosponsor S.3036. #FamiliesBelongTogether

— Senator Dianne Feinstein (@SenFeinstein) June 15, 2018

Department of Homeland Security Secretary Kirstjen Nielsen tweeted that DHS has merely “continued the policy from previous Administrations,” only separating families “if the child is in danger, there is no custodial relationship between ‘family’ members, or if the adult has broken a law.” Nielsen differentiated between those who arrive at designated ports as asylum seekers and those who arrive at other points. Some designated ports, however, are not accepting claims for asylum, and there have been reports of asylum-seekers being taken into custody regardless of their arrival location. Still more immigrants are simply unaware of the location of these designated ports.

For those seeking asylum at ports of entry, we have continued the policy from previous Administrations and will only separate if the child is in danger, there is no custodial relationship between 'family' members, or if the adult has broken a law.

— Secretary Kirstjen M. Nielsen (@SecNielsen) June 17, 2018

President Trump, meanwhile, has continued to use this humanitarian crisis as a bargaining tool, saying he will not approve any changes to immigration law unless it provides full funding for his wall on the Mexico border.

The Democrats are forcing the breakup of families at the Border with their horrible and cruel legislative agenda. Any Immigration Bill MUST HAVE full funding for the Wall, end Catch & Release, Visa Lottery and Chain, and go to Merit Based Immigration. Go for it! WIN!

— Donald J. Trump (@realDonaldTrump) June 15, 2018

“President Trump could stop this policy with a phone call,” said Senator Lindsey Graham (R-SC), a frequent golf-partner to the president. “I’ll go tell him. If you don’t like families’ being separated, you can tell D.H.S. stop doing it.”