Factbox: 'Witness intimidation is a crime': reaction to Trump impeachment hearing

Committee Chairman Rep. Adam Schiff (D-CA) (C) speaks while ranking member Devin Nunes (2nd R) (R-CA) looks on during former U.S. Ambassador to Ukraine Marie Yovanovitch's testimony before the House Intelligence Committee hearing as part of the impeachment inquiry into U.S. President Donald Trump on Capitol Hill in Washington, Washington, U.S., November 15, 2019. Alex Wong/Pool via REUTERS

(Reuters) - The U.S. House of Representatives Intelligence Committee held its second public hearing on Friday in an impeachment inquiry examining President Donald Trump's dealings with Ukraine, with Marie Yovanovitch, former U.S. ambassador to Ukraine, testifying.

As Yovanovitch testified, Trump fired off criticism of her on Twitter, a move Democrats labelled "real-time" witness intimidation.