Dallas Mavericks owner and longtime Donald Trump critic Mark Cuban has joined a growing list of sports-team owners defending NFL players' rights to share political views - and he's openly questioning whether the president can withstand their dissent. "LeBron and Steph and any owner, it's an open door now and so they have every right, for the same reasons, to be able to say whatever is on their mind. Cuban was referring in part to Trump's war of words with Golden State Warriors star Stephen Curry and New York Knicks legend LeBron James.