Sen. Cory BookerCory Anthony BookerIowa GOP swipes at 2020 Democrats' meat positions as candidates attend annual Steak Fry Booker aide sounds alarm about campaign's funding 2020 Democrats defend climate priorities in MSNBC forum MORE (D-N.J.) criticized Homeland Security Secretary Kirstjen NielsenKirstjen Michele NielsenKirstjen Nielsen drops out of Atlantic Media event after liberal backlash Pence taps former DHS spokeswoman as his new press secretary DHS officials called lawmaker visit to migrant detention facility a 'Hill stunt' MORE as complicit with President TrumpDonald John TrumpAlaska Republican Party cancels 2020 primary Ukrainian official denies Trump pressured president Trump goes after New York Times, Washington Post: 'They have gone totally CRAZY!!!!' 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."