Johnson: I'm writing a letter to 'lay out what I know' about Ukraine aid

Sen. Ron JohnsonRonald (Ron) Harold JohnsonTrump scramble to rack up accomplishments gives conservatives heartburn Hillicon Valley: Twitter to start verifying 2020 primary candidates | FTC reportedly weighs injunction over Facebook apps | Bill would give DHS cyber unit subpoena powers | FCC moves to designate 988 as suicide-prevention hotline Senate Republicans air complaints to Trump administration on trade deal MORE (R-Wis.), a member of the Senate Foreign Relations Committee, said he will lay out in a letter his telling of events related to the foreign aid to Ukraine that was held up and is now a central part of the impeachment inquiry.

"I got a letter last night from Reps. [Jim] Jordan [R-Ohio] and [Devin] Nunes [R-Calif.] asking for, basically, my telling of events. I'll be working on that today. I will lay out what I know," Johnson said Sunday on NBC's "Meet the Press." 

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He said he won't be called to testify, but he will reply to his GOP colleagues' request to tell his version of what happened, "which is difficult to do in eight or 10 minutes on a show like this."

Johnson defended President TrumpDonald John TrumpRepublicans aim to avoid war with White House over impeachment strategy New York Times editorial board calls for Trump's impeachment Trump rips Michigan Rep. Dingell after Fox News appearance: 'Really pathetic!' MORE and said Trump did not push Ukraine to publicly announce investigations before supplying the aid. 

Johnson said Trump "completely denied there is any kind of arrangement that Ukraine had to do something before he released that funding" when he spoke with him in August.

Johnson and Sen. Chris MurphyChristopher (Chris) Scott MurphyRepublicans aim to avoid war with White House over impeachment strategy On The Money: Trump, China announce 'Phase One' trade deal | Supreme Court takes up fight over Trump financial records | House panel schedules hearing, vote on new NAFTA deal Schumer: Trump 'sold out' on China trade deal MORE (D-Conn.) were the bipartisan Senate team charged with delivering aid to Ukraine. 

Murphy told NBC's Chuck ToddCharles (Chuck) David ToddChuck Todd challenges Cruz after senator pushes theory that Ukraine meddled in election Retiring House Democrat says a Trump reelection would be a 'nightmare scenario' for Congress Cruz on House impeachment inquiry: 'This is 'kangaroo court' MORE that Ukrainian President Volodymyr Zelensky knew the aide was suspended on Sept. 5. At that time, Murphy said he didn't know of "all these back channels that were happening regarding this extortion campaign." 

"The president was trying to use the power of his office to influence the upcoming election," Murphy said.