Former President Donald Trump will face his first of four criminal trials later this month, and his legal team is now making moves to dissuade the prosecution’s top witness from testifying. Newsweek reported Tuesday that Trump attorney Todd Blanche warned Manhattan District Attorney Alvin Bragg that he would face “serious legal and ethical consequences” if Michael Cohen — who worked as Trump’s lawyer and “fixer” for years — takes the witness stand in Manhattan. He also contrasted Bragg’s treatment of former Trump Organization chief financial officer Allen Weisselberg (who pleaded guilty to per…