On Monday morning, after America learned that Donald Trump’s former campaign chairman, Paul Manafort, and Manafort’s lobbying partner, Rick Gates, had been indicted and turned themselves in to federal authorities, the president tried to distance himself from the unfolding scandal. “Sorry, but this is years ago, before Paul Manafort was part of the Trump campaign,” the president wrote in one tweet. A few minutes later, he added, in another, “Also, there is NO COLLUSION!”

At almost the exact same time, news broke suggesting that the F.B.I. has evidence of collusion. We learned that one of the Trump campaign’s foreign policy aides, George Papadopoulos, pleaded guilty to lying to the F.B.I. about his attempts to solicit compromising information on Hillary Clinton from the Russian government. Despite Trump’s hysterical denials and attempts at diversion, the question is no longer whether there was cooperation between Trump’s campaign and Russia, but how extensive it was.

In truth, that’s been clear for a while. If it’s sometimes hard to grasp the Trump campaign’s conspiracy against our democracy, it’s due less to lack of proof than to the impudent improbability of its B-movie plotline. Monday’s indictments offer evidence of things that Washington already knows but pretends to forget. Trump, more gangster than entrepreneur, has long surrounded himself with bottom-feeding scum, and for all his nationalist bluster, his campaign was a vehicle for Russian subversion.

We already knew that Manafort offered private briefings about the campaign to Oleg Deripaska, an oligarch close to President Vladimir Putin of Russia. The indictment accuses him of having been an unregistered foreign agent for another Putin-aligned oligarch, the former Ukrainian president Viktor Yanukovych. Trump wasn’t paying Manafort, who reportedly sold himself to the candidate by offering to work free. But he intended to profit from his connection with the campaign, emailing an associate, “How do we use to get whole?” If there were no other evidence against Trump, we could conclude that he was grotesquely irresponsible in opening his campaign up to corrupt foreign infiltration.