We all know that Donald Trump is a blunt, brash New Yorker (insert your "New Yawk" accent here). He's a street fighter and he won the presidency that way. Tens of millions of Americans love his tenacity and penchant for brawling. But there's a line. And Thursday morning, he crossed it. Tweeting nasty personal insults is just plain wrong, has no upside whatsoever and can actually end up hurting him politically with his crucial evangelical base. You see, when “Mika and Joe” trash President Trump, it's good for business and makes headlines. There really isn't a downside for them. But when the president responds in kind, the downside can be treacherous for him.