(WASHINGTON) — The emotional policy of separating children from their parents is also starting to divide Republicans and their allies as Democrats turn up the pressure.

Former first lady Laura Bush called the policy “cruel” and “immoral” while GOP Sen. Susan Collins expressed concern about it and a former adviser to President Donald Trump said he thought the issue was going to hurt the president at some point. Religious groups, including some conservative ones, are protesting.

Mrs. Bush made some of the strongest comments yet about the policy from the Republican side of the aisle.

“I live in a border state. 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,” she wrote in a guest column for the Washington Post Sunday. She compared it to the internment of Japanese-Americans during World War II, which she called “one of the most shameful episodes in U.S. history.”

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