Senate Majority Leader Mitch McConnell was just asked to comment on Lt. Col. Alexander Vindman’s testimony and if it concerns him.

McConnell said, “I’m not going to question the patriotism of any of the people coming forward.”

The Kentucky Republican repeatedly declined to answer questions about what he makes of Vindman’s allegations and said, “I’m not going to comment on the merits of what’s going forward.”

Some background: Today, Vindman, the National Security Council's top Ukraine expert, is testifying. He plans to tell House impeachment investigators that he was so troubled by President Trump's July phone call with Ukraine's president that he reported his concerns to a superior, according to a copy of his statement obtained by CNN.

Some Republicans have criticized Vindman, who earned a Purple Heart for his military service in Iraq. Former GOP Rep. Sean Duffy said, "It seems very clear that he is incredibly concerned about Ukrainian defense."

Trump also joined in the criticism of Vindman, claiming without evidence on Twitter this morning that he is a "Never Trumper."