Trump is fuming at his former lawyer Michael Cohen for revealing secretly recorded tapes of Trump discussing payouts to an alleged Playboy-bunny mistress. But he best be careful because Cohen could land Trump and at least one of his friends in legal trouble, in addition to driving the president up a wall. It’s a remarkable turnaround for the sycophantic New Yorker who was plaintively whining, “Boss, I miss you so much” in a phone call with Trump a year ago. But there doesn’t appear to be any going back for Cohen, who’s been leaking dirt on Trump all week. So what kind of damage can he really do?

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Trump Tower: The most serious allegation Cohen has made against his former boss is that Trump was aware of the infamous Trump Tower meeting where an alleged Russian government emissary, Natalia Veselnitskaya, offered the Trump campaign—including Donald Trump Jr., Jared Kushner, and other senior campaign officials—dirt on Hillary Clinton. That meeting and a related statement from Team Trump are reportedly a primary focus of Special Counsel Robert Mueller’s investigators, who have grilled Trump staffers about their misleading statement to Times. The statement, passed off as written by Trump Jr., was actually dictated by Trump himself, who insisted on characterizing the meeting by its nominal agenda (Russian adoptions) rather than its actual one: getting Clinton dirt.