Former Secretary of State and Democratic presidential candidate Hillary ClintonHillary Diane Rodham ClintonNYT editorial board endorses Warren, Klobuchar for Democratic nomination for president Sanders v. Warren is just for insiders Alan Dershowitz: Argument president cannot be impeached for abusing power a 'strong one' MORE weighed in on President TrumpDonald John TrumpTrump rails against impeachment in speech to Texas farmers Trump administration planning to crack down on 'birth tourism': report George Conway on Trump adding Dershowitz, Starr to legal team: 'Hard to see how either could help' MORE's tweet on Friday that criticized a witness in the impeachment inquiry, stating "witness intimidation is a crime."

"Witness intimidation is a crime, no matter who does it. Full stop," the former secretary of State tweeted. 

Clinton's tweet follows a post by Trump about testifying witness and former ambassador to Ukraine Marie YovanovitchMarie YovanovitchHouse Democrats may call new impeachment witnesses if Senate doesn't Giuliani: 'I'd love to be a witness' at Senate impeachment trial Sunday shows preview: Lawmakers gear up for Senate impeachment trial MORE

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"Everywhere Marie Yovanovitch went turned bad," Trump tweeted Friday. "She started off in Somalia, how did that go? Then fast forward to Ukraine, where the new Ukrainian President spoke unfavorably about her in my second phone call with him. It is a U.S. President’s absolute right to appoint ambassadors."

Yovanovitch called the tweet "intimidating" after House Intelligence Committee Chairman Adam SchiffAdam Bennett SchiffDemocrats worry a speedy impeachment trial will shut out public Schiff huddles in Capitol with impeachment managers Trump defenders argue president can't be removed for abuse of power MORE (D-Calif.) read it to her during the hearing. 

"It’s very intimidating,” Yovanovitch said. “I can’t speak to what the president is trying to do, but I think the effect is to be intimidating.”

Yovanovitch was removed from her post in Ukraine earlier this year. She testified as part of the House's impeachment inquiry into Trump on Friday.