Michael Cohen, the president's former personal attorney, is expected to testify on Wednesday that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE previously told him and others that Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE "had the worst judgment of anyone in the world."

Cohen will allege to the House Oversight and Reform Committee that the president's eldest son would not have set up a June 2016 meeting with a Russian lawyer promising damaging information on Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE without letting his father know.

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Cohen will tell lawmakers that he was in a meeting with Trump that summer when Trump Jr. walked behind his father's desk and the two spoke in hushed tones.

“I recalled Don Jr. leaning over to his father and speaking in a low voice, which I could clearly hear, and saying: ‘The meeting is all set.’ I remember Mr. Trump saying, ‘Ok good … let me know,’” Cohen will say, according to prepared testimony released overnight Wednesday.

"What struck me as I looked back and thought about that exchange between Don Jr. and his father was, first, that Mr. Trump had frequently told me and others that his son Don Jr. had the worst judgment of anyone in the world," Cohen will say. "And also, that Don Jr. would never set up any meeting of any significance alone — and certainly not without checking with his father."

Trump has previously denied that he had prior knowledge of the Trump Tower meeting that involved his son, other campaign advisers and a Russian lawyer who had promised damaging information on Clinton.

Trump Jr. claimed the meeting was focused on Russian adoption policy, while the president later said the meeting was to collect information on his then-Democratic opponent.

Cohen, who worked for years as Trump's personal attorney and fixer, was sentenced late last year to serve three years in prison after he pleaded guilty to campaign finance law violations, bank fraud, tax fraud and lying to Congress about the timing of negotiations for a Trump Tower in Moscow.

Trump and his allies have slammed Cohen and attacked his credibility, noting that he previously lied to Congress. They have said he will say just about anything to reduce his prison sentence.

Trump Jr. has been critical of the timing of Cohen's testimony, which comes while the president is on a trip abroad.

"Only Democrats could hate someone so much that they would try to disrupt nuclear peace talks with testimony from a convicted felon," Trump Jr. tweeted Wednesday morning.

Only Democrats could hate someone so much that they would try to disrupt nuclear peace talks with testimony from a convicted felon. — Donald Trump Jr. (@DonaldJTrumpJr) February 27, 2019

Trump tweeted on Wednesday that Cohen was one of many lawyers who represented him. "He was just disbarred by the State Supreme Court for lying & fraud. He did bad things unrelated to Trump. He is lying in order to reduce his prison time. Using Crooked’s lawyer!" Trump tweeted.

Cohen is expected to accuse the president on Wednesday of being a "conman," a "racist" and a "cheat," all while the president is holding his second summit with North Korea leader Kim Jong Un in Vietnam.

Updated at 9:42 a.m.