Last Week Tonight host John Oliver reveled in last week’s admission by President Donald Trump that he did not, as he had suggested on Twitter, tape his conversations with FBI Director James Comey before sacking him. "James Comey better hope that there are no 'tapes' of our conversations before he starts leaking to the press!" Trump tweeted back in May. On Thursday, Trump tweeted that he had no idea if someone taped conversations with Comey, but he did not have any such…