House Republicans are asking Sen. Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' The Hill's 12:30 Report: Ginsburg lies in repose CHC leaders urge Senate to oppose Chad Wolf nomination MORE (R-Wis.), who has defended 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’s handling of Ukraine, to provide information in the impeachment inquiry.

In a letter sent to Johnson on Saturday, Reps. Jim Jordan James (Jim) Daniel JordanHouse panel pulls Powell into partisan battles over pandemic Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election House passes resolution condemning anti-Asian discrimination relating to coronavirus MORE (Ohio) and Devin Nunes Devin Gerald NunesOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Trump nominates former Nunes aide to serve as intel community inspector general Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election MORE (Calif.), the top Republicans in the impeachment investigation, called for Johnson to provide any firsthand information relevant to the inquiry.

“According to information obtained during the Democrats' ‘impeachment inquiry’ and news reports, you have firsthand information about facts at issue in this inquiry,” the two wrote in the letter.

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The letter noted that Johnson was a part of the U.S. delegation to Ukrainian President Volodymyr Zelensky’s inauguration earlier this year, as well as part of a debriefing by that delegation of Trump. It also said Johnson had held conversations with several witnesses in the impeachment inquiry, including acting U.S. Ambassador to Ukraine William Taylor and U.S. Ambassador to the European Union Gordan Sondland, who will testify Wednesday.

“You also participated in phone calls with Ambassador Sondland and President Trump, and a meeting with President Zelensky, Senator [Chris] Murphy [(D-Conn.)], and Ambassador Taylor in Kyiv on September 5. These events are relevant to the ‘impeachment inquiry,’” the letter said.

Johnson defended the president during an appearance on NBC’s “Meet the Press” on Sunday, stating that he does not believe U.S. security assistance to Ukraine was contingent on the country publicly announcing an investigation into 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 and his son Hunter Biden.

"I got a letter last night from Jordan and Nunes asking for, basically, my telling of events. I'll be working on that today. I will lay out what I know," he said, adding that he does not believe he will be called before the House Intelligence Committee to testify.

Sondland in closed-door testimony to the Intelligence Committee has linked the security assistance to investigations, and other witnesses have also drawn a link between the two. The security assistance was eventually sent to Ukraine, but only after a lengthy delay that unnerved officials in Ukraine and the Trump administration.

Jordan and Nunes blasted the inquiry as “one-sided, partisan, and fundamentally unfair” in their letter.