The Trump administration on Monday pushed back against criticism from former first lady Laura Bush of its “zero tolerance” policy that has led to the separation of migrant families.

White House press secretary Sarah Huckabee Sanders and Department of 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 blamed past administrations, including George W. Bush’s, for signing off on laws that led to the current crisis.

“Frankly, this law was actually signed into effect in 2008 under [Laura Bush’s] husband’s leadership, not under this administration,” Sanders said during Monday’s press briefing.

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“We’re not the ones responsible for creating this problem. We’ve inherited it,” she added. “But we’re actually the first administration stepping up and trying to fix it.”

Sanders to Laura Bush: "Frankly this law was actually signed into effect in 2008 under her husband's leadership. Not under this administration" pic.twitter.com/PFxfi5eFtU — Washington Examiner (@dcexaminer) June 18, 2018

Bush penned an op-ed for The Washington Post on Sunday in which she lambasted the Trump administration's "zero tolerance" policy that has led to the separation of thousands of migrant children from their parents. The former first lady seldom comments on the current administration.

“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.”

Former first ladies Michelle Obama Michelle LeVaughn Robinson ObamaBlack stars reimagine 'Friends' to get out the vote Obama shares phone number to find out how Americans are planning to vote Michelle Obama: 'Don't listen to people who will say that somehow voting is rigged' MORE, Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE and Rosalynn Carter have joined in on the growing criticism of the policy.

First lady Melania Trump Melania TrumpTrump privately blamed Black Americans for lacking initiative: report The Hill's 12:30 Report: Ginsburg lies in repose Melania Trump: Ginsburg's 'spirit will live on in all she has inspired' MORE also weighed in on Sunday, saying she "hates to see children separated from their families," but echoed the administration's calls for a legislative fix.

Nielsen took questions during Monday’s briefing, where she attempted to argue that the current administration is merely enforcing the laws.

Asked for a response to comments from Bush and the current first lady, Nielsen said she “shares their concerns.” However, she repeatedly put the onus on Congress to address the issue.

“Calling attention to this matter is important. This is a very serious issue that has resulted after years and years of Congress not taking action,” she said.

“So I would thank them both for their comments, I would thank them both for their concerns. I share their concerns,” she continued. “But Congress is the one that needs to fix this.”