House chairman blasts Nielsen's tenure as a 'disaster from the start'

House Homeland Security Committee Chairman Bennie ThompsonBennie Gordon ThompsonHillicon Valley: Trump turns up heat on Apple over gunman's phone | Mnuchin says Huawei won't be 'chess piece' in trade talks | Dems seek briefing on Iranian cyber threats | Buttigieg loses cyber chief House Democrats request briefings on Iranian cyber threats from DHS, FCC Democrats sound election security alarm after Russia's Burisma hack MORE (D-Miss.) on Sunday called Kirstjen NielsenKirstjen Michele NielsenActing DHS secretary says he expects Russia to attempt to interfere in 2020 elections House Homeland Security rip DHS's 'unacceptable' failure to comply with subpoena Trump puts Kushner in charge of overseeing border wall construction: report MORE's tenure as Homeland Security secretary a "disaster," moments after President TrumpDonald John TrumpSanders apologizes to Biden for supporter's op-ed Jayapal: 'We will end up with another Trump' if the US doesn't elect progressive Democrats: McConnell impeachment trial rules a 'cover up,' 'national disgrace' MORE announced she was leaving her post.

"Hampered by misstep after misstep, Nielsen's tenure at the Department of Homeland Security [DHS] was a disaster from the start," Thompson said in a statement. "It is clearer now than ever that the Trump Administration's border security and immigration policies - that she enacted and helped craft - have been an abysmal failure and have helped create the humanitarian crisis at the border." 

"It is truly unfortunate that Nielsen refused to take responsibility for her actions and was simply unable to lead and stand up to the President for his misguided, wall obsessed anti-immigrant agenda," he continued. 

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Trump on Sunday abruptly announced via Twitter that Nielsen was leaving her position as the top official at Homeland Security. Customs and Border Protection Commissioner Kevin McAleenan is set to replace Nielsen as acting DHS secretary, Trump said. 

Nielsen, who took over as head of the agency in 2017, helped lead the Trump administration's sprawling efforts with regard to immigration enforcement and disaster relief, among other things. 

She gained increased scrutiny from Democratic lawmakers over her role in the administration's "zero tolerance" policy that led to thousand of separations of migrant families along the U.S.-Mexico border. Trump signed an executive order in 2018 to end the practice. 

But Thompson cautioned against making Nielsen a "scapegoat for the situation at the border."

"Let me be clear, President Trump is to blame for making the situation at the border worse," he said. "His terrible and cruel policies have broken families apart and have caused chaos in our immigration system. This is now self-evident."