Donald Trump Jr slammed former White House advisor Steve Bannon on Wednesday after it was reported that Bannon claimed last July that his meeting with a Russian lawyer was "treasonous" and there's "zero" chance his father didn't know about it. "Steve had the honor of working in the White House & serving the country. Unfortunately, he squandered that privilege & turned that opportunity into a nightmare of backstabbing, harassing, leaking, lying & undermining the President. Steve is not a strategist, he is an opportunist," Don Jr. wrote on Twitter.