Sen. Dianne Feinstein Dianne Emiel FeinsteinFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Democrats shoot down talk of expanding Supreme Court Biden leads Trump by 12 points among Catholic voters: poll MORE (D-Calif.) blasted the Trump administration over family separations late Monday, saying the U.S. is not Nazi Germany.

"This is the United States of America. It isn't Nazi Germany, and there's a difference. And we don't take children from their parents until now and I think it's such a sad day. People are so upset," Feinstein said on MSNBC's "All In With Chris Hayes."

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The senator went on to praise a recent op-ed by former first lady Laura Bush, which also ripped the policy, calling it cruel.

"I just read a wonderful letter to the editor by Laura Bush. I can't believe that this is happening in the United States, and the president insists. So we, of course, will do everything we can to pass a bill which would prohibit this," Feinstein said.

The Trump administration has laid blame on previous administrations, Democrats and Congress for a policy that has resulted in family separations at the southern border.

“We’re not the ones responsible for creating this problem. We’ve inherited it,” press secretary Sarah Huckabee Sanders said at the White House press briefing on Monday. “But we’re actually the first administration stepping up and trying to fix it.”

“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,” 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 said at the briefing.

“So I would thank them both for their comments, I would thank them both for their concerns. I share their concerns,” she continued, speaking of the first ladies who have spoken out about the policy. “But Congress is the one that needs to fix this.”

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 is slated to meet with House Republicans on Tuesday to discuss a GOP bill shielding young immigrants from deportation.

He doubled down on the immigration policy in a series of tweets on Monday, and also called on Congress to fix the policy.

"Children are being used by some of the worst criminals on earth as a means to enter our country. Has anyone been looking at the Crime taking place south of the border. It is historic, with some countries the most dangerous places in the world. Not going to happen in the U.S.," the president said.

Children are being used by some of the worst criminals on earth as a means to enter our country. Has anyone been looking at the Crime taking place south of the border. It is historic, with some countries the most dangerous places in the world. Not going to happen in the U.S. — Donald J. Trump (@realDonaldTrump) June 18, 2018

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