President Trump's announcement this morning banning transgender individuals from military service stated that their service would cause the military to be "burdened with tremendous medical costs and disruption." However, a 2016 study by the nonpartisan RAND Corporation on the topic indicated just the opposite.

Why it matters: The reasons that Trump and his "generals and military experts" gave for the ban don't stand up to scrutiny, and the announcement seems more of a play to his base and a distraction from his growing discontent with Attorney General Jeff Sessions.