Michael Cohen has agreed to cooperate with special counsel Robert Mueller’s investigation into ties between President Trump and Russia during the 2016 election. The agreement between Trump’s former fixer and Mueller was revealed Thursday after Cohen pleaded guilty to lying to Congress about his discussions to build a Trump Tower in Moscow. Among Cohen’s admissions to Mueller were that he discussed the tower well into the 2016 campaign and that he briefed Trump and family members about it multiple times. Cohen reportedly sat with the special counsel’s office for more than 70 hours. Cohen’s first sit-down with the office was on Aug. 7, according to court papers, two weeks before he pleaded guilty to violating campaign-election law on Trump’s behalf to silence Stormy Daniels and Karen McDougal.