Sen. Cory BookerCory Anthony BookerBooker gains first endorsement from state lawmaker in South Carolina CNN town halls put network at center of Dem primary Amy Poehler reveals which Dem candidates her 'Parks and Recreation' character might vote for MORE (D-N.J.) criticized Homeland Security Secretary Kirstjen NielsenKirstjen Michele NielsenHillicon Valley: Nunes sues Twitter for 0 million | Trump links tech giants to 'Radical Left Democrats' | Facebook settles suits over ad discrimination | Dems want answers over spread of New Zealand shooting video Nielsen calls for greater public-private collaboration on cyber threats The Hill's Morning Report - Dems contemplate big election and court reforms MORE as complicit with President TrumpDonald John TrumpSenate GOP budget ignores Trump, cuts defense Trump says he'll nominate Stephen Moore to Fed White House: ISIS territory in Syria has been 100 percent eliminated 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."