Republican Speaker of the House of Representatives Mike Johnson has called on Joe Biden to resign from his office “immediately” following his withdrawal from the US presidential race. Johnson wrote on the social media platform X: “If Joe Biden is not fit to run for President, he is not fit to serve as President. He must resign the office immediately. November 5 cannot arrive soon enough.” Johnson characterized Biden’s withdrawal as an unprecedented moment in US history. “We must be clear about what just happened,” he wrote. “The Democrat Party forced the Democrat nominee off the ballot, just o…