Former White House chief of staff John Kelly John Francis KellyMORE said Friday that ending the impeachment trial against President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE without calling in witnesses is “a job only half done.”

Kelly made the comments at an event at Drew University in New Jersey just hours before the Senate is expected to vote down a push by Democrats to bring in witnesses for the proceedings.

“In my view, they kind of leave themselves open to a lot of criticism,” he said, NJ Advance reported.

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Kelly responded to a Tuesday Quinnipiac University poll that reported three-quarters of U.S. voters support calling witnesses in the Senate trial. Several GOP senators who have advocated against the move argue that the public will decide Trump’s fate in the presidential election, though Kelly argues that they are avoiding their congressional duties.

“If I was advising the United States Senate, I would say, 'If you don’t respond to 75 percent of the American voters and have witnesses, it’s a job only half done,” he said. “You open yourself up forever as a Senate that shirks its responsibilities.”

Kelly was Trump's chief of staff from June of 2017 to January of last year and was replaced by acting Office of Management and Budget Director Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE, whom Democrats have said they would like to see testify before the Senate.

They also seek the testimony of former national security adviser John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE, whose forthcoming White House memoir reportedly backs allegations that Trump sought to use hundreds of millions of dollars in aid to Ukraine to pressure the nation into announcing investigations that would benefit him politically.

Earlier this week, Kelly spoke at an event in Florida and said that he believes the scenes described in a manuscript of Bolton's book.