Former Secretary of State and Democratic presidential candidate Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE weighed in on 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'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.

Witness intimidation is a crime, no matter who does it. Full stop. — Hillary Clinton (@HillaryClinton) November 15, 2019

Clinton's tweet follows a post by Trump about testifying witness and former ambassador to Ukraine Marie Yovanovitch Marie YovanovitchGrand jury adds additional counts against Giuliani associates Lev Parnas and and Igor Fruman Strzok: Trump behaving like an authoritarian Powell backs Biden at convention as Democrats rip Trump on security 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 Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer 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.