Law professor Jonathan Turley says "his home and office were inundated with threatening messages" on Thursday for his testimony as a witness for House Republicans in this week’s impeachment proceedings on Capitol Hill.

“My call for greater civility and dialogue may have been the least successful argument I made to the committee,” Turley, who teaches at George Washington University, tweeted on Thursday.

“Before I finished my testimony, my home and office were inundated with threatening messages and demands that I be fired from GW.”

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Turley's testimony was hailed by Republicans after he argued that Democrats were pushing forward with impeaching President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE based on too little evidence.

He was the sole GOP witness invited to the hearing. Three other law professors invited by Democrats argued that Trump had committed impeachable offenses.

Turley argued it was Congress that was abusing its power by moving forward with impeachment without going through the courts to battle for more witness testimony. The administration has sought to block a number of officials from testifying.

“Will a slipshod impeachment make us less mad? Will it only give an invitation for the madness to follow in every future administration?” Turley said Wednesday. “This is not how you impeach an American president.

"If you make a high crime and misdemeanor out of going to the courts, it is an abuse of power. It's your abuse of power," Turley also said of Democratic lawmakers to the House Judiciary Committee.

Mark Zaid, a Washington attorney who represents the anonymous whistleblower whose report on Trump's call with Ukraine's president spurred the impeachment inquiry, tweeted that his client had received death threats.

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“Seriously. I’d take demands to be fired over death threats any day,” Zaid wrote on Twitter.

Seriously. I'd take demands to be fired over death threats any day. — Mark S. Zaid (@MarkSZaidEsq) December 5, 2019

Turley is an opinion contributor for The Hill and also a CBS News contributor. Turley also noted the threats in a column published by The Hill on Thursday.