Read opening statements of Lt. Col. Vindman and others testifying on Day 3 of public impeachment hearings

Vindman is the National Security Council’s Ukraine expert

Volker was the first witness to testify voluntarily -- without a subpoena -- behind closed doors in the impeachment proceedings.

Morrison, who listened in on President Donald Trump’s July 25 phone call with Ukrainian President Volodymyr Zelenskiy, said in closed-door testimony that he heard nothing illegal on the call, although he was concerned that, if it leaked, there could be political fallout.

Read Vindman's opening statement:

Read Williams' opening statement:

Read Volker's opening statement:

Read Morrison's opening statement: