"Even if President Trump follows up on his tweet announcing a ban on transgender Americans serving in the military, it is unlikely to pass muster with the courts, writes Noah Feldman for Bloomberg View. “A ban on service in the military is obviously a form of discrimination.”
 
“The only conceivable way it could be constitutional to ban transgender people would be if the government had a strong reason to do so -- a real reason, not a pretext made up to cover irrational bias.”

“Trump’s tweets mentioned two reasons. ‘Our military must be focused on decisive and overwhelming victory,’ he wrote, ‘and cannot be burdened with tremendous medical costs and disruption that transgender [sic] in the military would entail.’"

“Medical costs and disruption are thus the president’s chosen rationales. But he did not offer any evidence in support of either proposition. That makes both look highly suspicious. To put it bluntly, both sound made up.”

Everything he does looks highly suspicious!