Former President Donald Trump is responsible for the Republican Party’s long string of failures, former South Carolina Gov. Nikki Haley told CNN’s Jake Tapper on Thursday. Haley, who is the final remaining Republican candidate opposing Trump for the nomination, warned that the GOP needs a new direction to avoid sliding further into disaster — and this is reflected throughout the party leadership. “So how do you feel about the job Speaker Johnson’s doing?” asked Tapper. “He seems unable to do basic stuff without his speakership being threatened. Members of the House Freedom Caucus threatened to…