George Conway — the husband of top Donald Trump advisor Kellyanne Conway — on Sunday slammed Rudy Giuliani after the president’s lawyer claimed it’s “perfectly normal” for Trump to speak with Michael Cohen about his congressional testimony.

Speaking with CNN’s Jake Tapper on Sunday, Giuliani acknowledged the possibility that Trump and Cohen discussed Cohen’s testimony before he spoke to Congress. According to Cohen’s guilty plea in the special counsel investigation, Trump’s former fixer lied to Congress on three occasions about plans to build a Trump Tower in Moscow, claiming the negotiations ended in January 2016. Giuliani on Sunday acknowledged those negotiations likely lasted until November 2016.

“As far as I know. President Trump did not have discussions with [Cohen], certainly had no discussions with him in which he told him or counseled him to lie,” Giuliani claimed, before adding it “would be perfectly normal” for Trump to have discussed testimony with Cohen.

Referring to that interview, Conway hit back at the administration in which his wife serves.

“Perfectly normal?” Conway asked. “It’s perfectly insane for witnesses in or subject of a criminal investigation to be discussing testimony.”

“Perfectly normal?” It’s perfectly insane for witnesses in or subjects of a criminal investigation to be discussing testimony. https://t.co/FlNP2GC2TZ

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— George Conway (@gtconway3d) January 20, 2019

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I’m trying to imagine what the reaction of the United States Attorney for the Southern District of New York in 1988 would have been to this “perfectly normal” assertion—and just can’t. https://t.co/FlNP2GC2TZ

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— George Conway (@gtconway3d) January 20, 2019

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Conway retweeted a response from homeland security consultant Paul Rosenzweig, who added the move is also “perfectly criminal.” He later posted former federal prosecutor Renato Marrioti’s response:

If you and another person are under criminal investigation and you discuss his testimony with him, you should expect prosecutors to investigate that conversation to determine if you obstructed justice. https://t.co/dFfFco2lNT

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— Renato Mariotti (@renato_mariotti) January 20, 2019

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Conway also praised CNN’s Tapper for his line of questioning directed at Giuliani.