Late-night host Stephen Colbert Stephen Tyrone ColbertColbert implores Pelosi to update 'weaponry' in SCOTUS fight: 'Trump has a literal heat ray' The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy Juan Williams: Democrats need to bury their divisions MORE on Monday knocked President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE as he asked the president's 2016 opponent, former Secretary of State Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE, about the prospects of a Trump impeachment amid a swirling scandal surrounding his contacts with Ukraine.

“Your fault for coming on Ukraine week,” Colbert, a frequent critic of the president, joked to Clinton.

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“We learned about the Trump-Ukraine call, the private server. Is it time to, dare I say, ‘lock him up?’ ” Colbert quipped, referencing the refrain Trump and his supporters commonly used to target Clinton during the 2016 election.

“What do you make of it?” he asked Clinton as the audience began a “lock him up” chant similar to the “lock her up” chants Trump supporters made during rallies leading up to the 2016 election.

“We have started an impeachment inquiry, which will look at the evidence, and I think that’s exactly what should be done,” Clinton said.

“I believe strongly that this particular incident has had such a huge impact because we’ve known for a long time that he was a corrupt businessman who cheated people,” she said.

“But to see him in the office of the president, putting his own personal and political interests ahead of the national security of our country, just pierced through whatever confusion or denial people had,” she added later, eliciting applause from the audience.

Clinton’s comments come amid controversy surrounding Trump’s contacts with Ukraine and reports that he urged Ukrainian President Volodymyr Zelensky to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, who is the front-runner in the 2020 Democratic presidential primary.

The former secretary of State said she backed impeaching Trump last week, saying he is a “clear and present danger to the U.S.”

"The president of the United States has betrayed our country. That’s not a political statement — it’s a harsh reality, and we must act," she tweeted. "He is a clear and present danger to the things that keep us strong and free. I support impeachment."