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

House Homeland Security Committee Chairman Bennie ThompsonBennie Gordon ThompsonTop Democrat demands answers from CBP on security of biometric data Hillicon Valley: 8chan owner defends platform before Congress | Facebook launches dating feature | New York City sues T-Mobile | Top NSA cyber official names ransomware as 2020 threat | Blue Dog Dems urge action on election security 8chan owner defends platform in testimony before Congress MORE (D-Miss.) on Sunday called Kirstjen NielsenKirstjen Michele NielsenFox's Cavuto roasts Trump over criticism of network DOJ to Supreme Court: Trump decision to end DACA was lawful Top immigration aide experienced 'jolt of electricity to my soul' when Trump announced campaign MORE's tenure as Homeland Security secretary a "disaster," moments after President TrumpDonald John TrumpBusiness, ballots and battling opioids: Why the Universal Postal Union benefits the US Sanders supporters cry foul over Working Families endorsement of Warren California poll: Biden, Sanders lead Democratic field; Harris takes fifth 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. 

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."