Donald Trump took to Twitter on Sunday to slam Jennifer Williams, an aide to Vice President Mike Pence who's due to testify in the public impeachment inquiry into the president's actions with Ukraine.
Trump called Williams a "Never Trumper." The longtime State Department employee — currently a special adviser to Pence — was on the July 25 phone call that's at the center of the inquiry, and said in closed-door testimony on Nov. 7 that she found some of the discussion between Trump and Ukraine's president "unusual and inappropriate."
She's due to testify on Tuesday alongside Alexander Vindman, the top Ukraine expert on the White House National Security Council. They are among eight witnesses to testify before the committee this week.