MSNBC’s Mika Brzezinski on Monday challenged one of the New York Times editors who called on President Joe Biden to drop out of the presidential race. The newspaper’s editorial board formally called for Biden to step aside after his faltering performance in Thursday night’s presidential debate against Donald Trump, and board member Mara Gay justified that position Monday on “Morning Joe.” “Ever since Donald Trump has been in the public eye, we have made clear that this is not a president, a former president, who we supported,” Gay said. Want more breaking political news? Click for the latest h…