WASHINGTON -- As the impeachment inquiry develops, former Dallas congressman Pete Sessions’ name keeps appearing in testimony about the Ukraine scandal engulfing Donald Trump’s administration.

Sessions was mentioned dozens of times in the transcripts of depositions from State Department and administration officials released last week, amid questions about his role in the removal Marie Yovanovitch as U.S. ambassador to Ukraine.

He has denied any wrongdoing and vowed to cooperate with federal prosecutors in New York who have charged two Soviet-born businessmen tied to the smear campaign against Yovanovitch.

Here’s the timeline of Sessions’ involvement, according to that indictment and testimony that has surfaced in the impeachment inquiry:

May and June of 2018: Soviet-born businessmen commit to raise $20,000 for Sessions

Igor Fruman and Lev Parnas, now U.S. citizens, met with Sessions and promised to raise $20,000 or more for his campaign. Before that meeting, they had already donated $325,000 to America First Action – a pro-Trump super PAC that would end up spending roughly $3 million on Sessions’ behalf in failed reelection bid against Democrat Colin Allred in 2018.

The duo also sought his help in removing Yovanovitch, pursuing an agenda desired by at least one Ukrainian government official, according to the indictment of Fruman and Parnas, unveiled in October after their arrest as they tried to fly to Europe with one-way tickets.

May 9, 2018: Parnas posts photo with Sessions, and Sessions urges Pompeo to fire Yovanovitch

Sessions wrote Secretary of State Mike Pompeo urging him to remove Yovanovitch from her post as the top U.S. diplomat in Kyiv. He said last month that he wanted her fired because “several congressional colleagues” told him that she “was disparaging President Trump.” He has so far declined to identify those colleagues. Yovanovitch testified that she was unaware of Sessions’ letter before a news report last March by a journalist who had been airing allegations against her.

The same day, Parnas posted photos on Facebook in which he is shown at the Capitol, posing with Sessions.

Sessions has denied taking any official action as a result of any request or meeting with the men.

June 25, 2018: Illegal payment made by Fruman and Parnas to Sessions’ campaign

Fruman, having hit the $2,700 federal cap on campaign donations, makes another $2,700 contribution to Sessions under Parnas’ name, according to the indictment. Repaying someone for a contribution to circumvent the cap is illegal. The indictment says this was part of the pair’s promise to raise at least $20,000 for Sessions’ campaign in return for his help removing Yovanovitch.

October 2018: Fruman and Parnas lie to FEC about the June 25 donation

In affidavits to the Federal Election Committee in response to a complaint about the June 25 donation, Fruman and Parnas maintained that Parnas made the donation with a business credit card that he then reimbursed, which was not true, according to the indictment.

April 24: Yovanovitch ouster

The top foreign service personnel official tells Yovanovitch by phone to “come home on the next plane.” On April 29 in Washington, Deputy Secretary of State John Sullivan tells her she has been recalled from her post in Kyiv. Her last official day was May 20.

“He said that the president had lost confidence in me, and no longer wished me to serve as an ambassador,” Yovanovitch testified. “He added that there had been a concerted campaign against me, and that the department had been under pressure from the president to remove me since the summer of 2018. He also said that I had done nothing wrong, and that this was not like other situations where he had recalled ambassadors for cause.”

October 9: Fruman and Parnas arrested on campaign finance violations

The two businessmen were arrested at Dulles International Airport with one-way tickets to Europe. The two were scheduled to testify that week in the House impeachment probe.