Sen. Cory BookerCory Anthony BookerGillibrand seizes on abortion debate to jump-start campaign 2020 hopeful John Delaney unveils T climate plan Harris readies a Phase 2 as she seeks to rejuvenate campaign MORE (D-N.J.) criticized Homeland Security Secretary Kirstjen NielsenKirstjen Michele NielsenCongressional Hispanic Caucus demands answers on death of migrant children Trump expected to tap Cuccinelli for new immigration post Kobach gave list of demands to White House for 'immigration czar' job: report MORE as complicit with President TrumpDonald John TrumpA better VA, with mental health services, is essential for America's veterans Pelosi, Nadler tangle on impeachment, contempt vote Trump arrives in Japan to kick off 4-day state visit 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."