Some of Fox News' biggest personalities expressed sympathy for former Ukraine Ambassador Marie Yovanovitch during her impeachment testimony on Friday — especially after President Trump attacked her via Twitter mid-hearing.

The state of play: Bret Baier called Trump's tweets "a turning point in this hearing," noting that Yovanovitch was "already a sympathetic witness" and that it allowed House Intelligence Chairman Adam Schiff (D-Calif.) to raise the possibility of witness tampering.

Yovanovitch called the tweets "very intimidating" after Schiff read them in real-time.

Chris Wallace similarly said on air during a break in the hearing: "If you are not moved by the testimony of Marie Yovanovitch today, you don't have a pulse."

Go deeper: Live updates on Yovanovitch's impeachment hearing