Former first lady Laura Bush tore into the Trump administration for separating migrant families at the border, calling the “zero tolerance” policy “cruel” and “immoral.”

Bush penned an op-ed for The Washington Post, which was published Sunday night as public outcry over the hundreds of children in detention centers intensified.

“I live in a border state,” Bush wrote. “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.”

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Bush’s commentary comes as more images and accounts from inside the detention centers have emerged, drawing harsh criticism from Democrats and some Republicans. Media reports about the centers described children being kept in “cages” after being separated from their parents, who crossed the border illegally.

Bush wrote that the detention centers were “eerily reminiscent” of Japanese-American internment camps during World War II.

“Americans pride ourselves on being a moral nation,” she wrote. “If we are truly that country, then it is our obligation to reunite these detained children with their parents — and to stop separating parents and children in the first place."

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 announced the so-called zero tolerance policy earlier this year, saying that the Justice Department would prosecute all adults crossing the border illegally, which could result in families being separated.

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 defended the administration in a series of tweets on Sunday, claiming that the administration does not have a policy of separating families at the border.

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 has repeatedly blamed congressional Democrats for not acting on immigration. Other members of the administration, however, have defended the policy as a necessary border security measure.

In her op-ed, Bush called for “good people at all levels of government” to address the problem.

“In 2018, can we not as a nation find a kinder, more compassionate and more moral answer to this current crisis?” she wrote. “I, for one, believe we can.”