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.) told reporters Thursday he did not recall signing a letter urging reforms in the office of the Ukrainian prosecutor 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 has alleged 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 improperly had ousted, The Milwaukee Journal-Sentinel reported.

Trump has repeatedly alleged Biden used his office to have Prosecutor General Viktor Shokin fired and prevent him from investigating a gas company whose board included Biden’s son Hunter.

CNN on Thursday reported that three Republican senators, including Johnson, Sen. Rob Portman Robert (Rob) Jones PortmanMcConnell locks down key GOP votes in Supreme Court fight Romney undecided on authorizing subpoenas for GOP Obama-era probes Congress needs to prioritize government digital service delivery MORE (R-Ohio) and then-Sen. Mark Kirk Mark Steven KirkLiberal veterans group urges Biden to name Duckworth VP On the Trail: Senate GOP hopefuls tie themselves to Trump Biden campaign releases video to explain 'what really happened in Ukraine' MORE (R-Ill.) signed a 2016 letter urging “urgent reforms to the Prosecutor General’s office and Judiciary.”

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"I send out all kinds of oversight letters ... I don't know which 2016 oversight letter you're referring to so I will look at that and then we'll issue a press release, statement, or something — but I don't engage in hypocrisy. I'm looking at getting the truth,” Johnson said when asked about the letter.

Johnson did acknowledge the letter in an interview Thursday on WIBA's "The Vicki McKenna Show," saying "The whole world, by the way, including the Ukranian caucus, which I signed the letter, the whole world felt that this that Sholkin wasn't doing a [good] enough job. So we were saying hey you've ... got to rid yourself of corruption."

In the first interview, Johnson also said there was no misconduct in Trump’s call on Thursday for China to investigate Biden and his son.

"If there's potential criminal activity, the President of the United States is our chief law enforcement officer. We have proper agreements with countries to investigate potential crimes so I don't think there's anything improper about doing that,” he said.

Even as he endorsed investigations by both China and Ukrainian officials, Johnson denied the July 25 call between Trump and Ukrainian President Volodymyr Zelensky at the heart of a whistleblower complaint represented Trump pressuring Zelensky to investigate the Bidens.

"I look at that transcript and I go, it's Trump being Trump," Johnson said, according to the Journal-Sentinel.

In a statement, Andrew Bates, rapid response director for the Biden campaign, told The Hill: "“The United States, the European Union, the I.M.F., and Ukraine's leading reform figures were all pressing for Viktor Shokin to be removed from office because he was one of the biggest obstacles to fighting corruption in the entire country. This was a bipartisan goal in Congress as well."

"It is unfortunate that Senator Johnson seems to have forgotten a time when he put the country's values over his own politics, but perhaps re-reading his well-articulated words whole-heartedly agreeing with Joe Biden's push to move the anti-corruption cause in Ukraine forward will help him on his journey back to intellectual consistency," Bates added.

Updated: 9:35 p.m.