White House's official Twitter account attacks Vindman as he testifies

• Last week, Trump attacked former Ukraine Ambassador Marie Yovanovitch from his personal account, prompting Democrats to allege that he was engaging in real-time witness intimidation.

Earlier in the hearing, Rep. Jim Jordan (R-Ohio) asked Vindman about Morrison's concerns about his judgment. Vindman, who is still employed by the National Security Council, responded by reading aloud former top Russia adviser Fiona Hill's final performance review of his work:

"Alex is a top 1% military officer and the best Army officer I have worked with in my 15 years of government service. He is brilliant, unflappable and exercises excellent judgment."

Go deeper:

• Vindman calls Ukrainian election interference conspiracy theory "a Russian narrative"
• Vindman refuses to answer questions amid fear of outing whistleblower
• Vindman and Williams testify that Biden-Ukraine allegations lack credible evidence