The two men from Florida named by the Ambassador - Lev Parnas and Igor Fruman - were arrested as they attempted to leave the United States in October, and subsequently charged with campaign finance violations.
Asked about criticism featured in the rough transcript of the phone call between President Trump and the Ukraine leader, Yovanovitch said she was worried by what she read in that White House document - as the President called her 'bad news.'
"I hate to be repetitive, but I was shocked," the Ambassador testified, as investigators pointed out where Mr. Trump said she was 'going to go through some things.'
"Did you feel threatened?" Yovanovitch was asked.
"Yes," she replied.
The other transcript released on Monday came from Michael McKinley, who recently resigned as a top aide to Secretary of State Mike Pompeo.
Two more transcripts will be released on Tuesday, from the former special U.S. envoy to Ukraine, Kurt Volker, and from the U.S. Ambassador to the European Union, Gordon Sondland.