Mitt Romney Willard (Mitt) Mitt RomneyBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power The Memo: Trump's strengths complicate election picture MORE on Monday came out against President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s policy of separating migrant families at the southern border, saying that the U.S. needs a “more compassionate answer” to illegal crossings.

The former Massachusetts governor and current Utah GOP Senate candidate retweeted former first lady Laura Bush, who wrote an op-ed criticizing the policy as “cruel” and “immoral.”

I agree that we need a more compassionate answer. https://t.co/3NOPEF0G3o — Mitt Romney (@MittRomney) June 18, 2018

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Romney is one of a growing number of GOP figures to speak out against the policy. Republican Sens. Susan Collins Susan Margaret CollinsClub for Growth to spend million in ads for Trump Supreme Court nominee Maryland's GOP governor says Republicans shouldn't rush SCOTUS vote before election The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November MORE (Maine) and Jeff Flake Jeffrey (Jeff) Lane FlakeHow fast population growth made Arizona a swing state Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden MORE (Ariz.) wrote a letter to Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenMore than million in DHS contracts awarded to firm of acting secretary's wife: report DHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections MORE seeking clarification on the policy.

Collins said Sunday that she does not support the policy, which she called “inconsistent with our American values.”

All 49 members of the Senate Democratic caucus have pledged support for legislation to prevent the separation of families at the border. No Republican senators have yet said they would support the bill.

The Trump administration earlier this year announced a “zero tolerance” policy to prosecute adults crossing the border illegally, leading to thousands of migrant children being separated from their parents.

In recent days, images and accounts from undocumented youth detention centers have emerged, sparking major outcry from primarily Democratic lawmakers.

Trump has incorrectly and repeatedly claimed that the policy is the “law” and has blamed Democrats for not acting on immigration legislation.

But Trump administration officials, including Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE and chief of staff John Kelly John Francis KellyMORE, have defended the policy as a necessary border security measure. And Nielsen insisted Sunday that the administration does not “have a policy” to separate families.

Trump is scheduled to meet with House Republicans about immigration on Tuesday.