Presidential candidate Julian Castro says he knows a bunch of U.S. pro athletes HATE going to the White House now that Donald Trump's in charge ... and says he plans on changing that, if he gets elected.
Fresh off his widely-praised performance at the Democratic debates, Castro told he didn't sleep last night ... and was still replying to all the texts he got!
But when we started talking sports -- in the wake of Trump's new beef with Team USA soccer star Megan Rapinoe -- Castro mustered up the energy to take another shot at POTUS.