In an upcoming book, Michael Cohen, President Donald Trump’s former attorney, alleges that Trump worked with Russia to win the 2016 presidential election.

Among many other accusations, Cohen alleges that Trump worked to get close to Russian President Vladimir Putin and “his coterie of corrupt billionaire oligarchs,” according to an excerpt released Thursday from the book, entitled “Disloyal, A Memoir.” Cohen did not provide details on precisely how Trump and Russia worked together.