Jonathan Turley, the George Washington University law professor who testified on behalf of the Republicans at Wednesday's impeachment hearing, said he's already fallen victim to threats.

'My call for greater civility and dialogue may have been the least successful argument I made to the committee,' Turley tweeted Thursday. 'Before I finished my testimony, my home and office were inundated with threatening messages and demands that I be fired from GW.'

Turley had appeared as the GOP's sole witness during the House Judiciary Committee's first impeachment-related hearing, despite telling the audience that he didn't vote for President Trump.

George Washington University law professor Jonathan Hurley testified as the only Republican witness in Wednesday's House Judiciary Committee hearing on impeachment

Jonathan Turley wrote a column for the Hill and wrote in a tweet that he was being threatened thanks to his testimony on behalf of the Republicans

He had cautioned Congress not to rush impeachment.

And argued that Democrats should wait while some of the cases make their way through the courts.

'It's a perfect storm,' warned Turley. 'You get an incredibly short period, demand a huge amount of information and when the president goes to court you impeach him.'

'Now, does that track with what you've heard about impeachment? Does that track with the rule of law we've talked about?' Turley went on.

He pointed out that President Richard Nixon, who was threatened with impeachment and removal, 'did go to the courts.'

'And Nixon lost and that was the reason Nixon resigned,' Turley said.

He said Democrats simply didn't have a strong enough case yet.

At the hearing, Turley also talked about the current toxic political climate.

He descibed it as one of 'madness.'

'I get it, you're mad,' the professor said. 'The president's mad. My Republicans friends are mad. My Democratic friends are mad. My wife is mad. My kids are mad. Even my dog seems mad – and Luna's a Golden Doodle, and they don't get mad,' he said, earning some laughs.

'So we're all mad,' he stated.

On Thursday, Turley was mad that nobody seemed to heed his call for civility.

In an op-ed in the Hill, Turley named some of his more well-known detractors, including MSNBC's Rachel Maddow and Dana Milbank, a columnist for the Washington Post, who were both critical of his testimony.

He also called out Rep. Eric Swalwell, a California Democrat, for a particularly personal line of questioning Wednesday.

'Not all Democrats supported such scorched earth tactics. One senior Democrat on the committee apologized to me afterward for the attack from Swalwell,' Turley noted.

Though he added that many 'relished' him being - in his view - unfairly attacked.