MSNBC morning show host Joe Scarborough told Late Show host Stephen Colbert he's having trouble transitioning from calling POTUS “Donald" to "Mr. President.” "I'll be really honest with you; the way he's acted over the past month has made it even harder to call him Mr President,” Scarborough said, noting, disapprovingly, that Trump has questioned judicial review and the legitimacy of a federal judge. Republicans in the Senate, in particular, need to stand up and say…