"Tim Morrison, Alexander Vindman's former boss, testified in his deposition that he had concerns about Vindman's judgment," the tweet read.

It was a remarkable broadside from the official voice of the executive branch against the President's own top Ukraine expert, a decorated Iraq War veteran who testified in a public impeachment hearing on Tuesday.

And it continued a pattern, begun by Trump, of lashing out against impeachment witnesses even as they continue to work for him and as Democrats warn against witness intimidation.

The tweet from the official White House account, funded by taxpayer dollars, quoted closed-door testimony from Morrison, Vindman's former superior, who raised concerns about the lieutenant colonel's judgment. It included a specially made graphic using a quote from the interview, which read: "I had concerns about Lieutenant Colonel Vindman's judgment."

Read More