Sen. Cory BookerCory Anthony BookerBooker: Trump is 'worse than a racist' Cory Booker talks about 'geeking out' over Rosario Dawson's Marvel role Harris faces pressure to define policy proposals MORE (D-N.J.) criticized Homeland Security Secretary Kirstjen NielsenKirstjen Michele NielsenTrump quietly rolled back programs to detect, combat weapons of mass destruction: report Trump's family separation policy has taken US to 'lowest depth possible,' says former immigration lawyer Four heated moments from House hearing on conditions at border facilities MORE as complicit with President TrumpDonald John TrumpLiz Cheney: 'Send her back' chant 'inappropriate' but not about race, gender Booker: Trump is 'worse than a racist' Top Democrat insists country hasn't moved on from Mueller MORE for saying she did not hear him say the United States should not accept immigrants from "shithole countries."

"When ignorance and bigotry is allied with power, it's a dangerous force in our country. Your silence and your amnesia is complicity," Booker told Nielsen during a Senate Judiciary Committee hearing. 

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Nielsen said during questioning at the hearing that it was "possible" Trump used the vulgar term to describe Haiti and other countries during an Oval Office meeting attended by several lawmakers, but she could not hear him using the expletive. 

"It was a meeting of 12 people. There was cross-talk," Nielsen told the panel. "Anything is possible. I can't testify to what I don't know." 

Booker, an African-American senator, called Trump's reported remarks "the most vile and vulgar language."