The acting director of the F.B.I., Andrew McCabe, told Congress on Thursday that President Trump’s firing of James Comey has not derailed the agency’s investigation into possible collusion between Russia and the Trump campaign. Which is good news. Despite Mr. Trump’s assertion that the idea of collusion is “a total hoax,” and despite many unknowns, the links continue to pile up. Here is a partial accounting of the connections we do know something about.

THE TRUMP FAMILY BUSINESS There may be no Trump Tower in Moscow or St. Petersburg, but it is not for lack of trying. Mr. Trump and his family have sought to do business in Russia since at least the 1980s. They have also developed extensive commercial and personal relationships with politically connected Russian businessmen. In 2008, Donald Trump Jr. told a real estate conference, “Russians make up a pretty disproportionate cross section of a lot of our assets; say in Dubai, and certainly with our project in SoHo and anywhere in New York,” according to eTurboNews, a travel industry news site. The author James Dodson said that another son, Eric Trump, told him in 2013 that Russians have bankrolled Trump golf courses: “Well, we don’t rely on American banks. We have all the funding we need out of Russia.” Eric Trump denies saying that.

In addition, Donald Trump worked with the Agalarov family, a prominent Russian business group, to host the 2013 edition of his Miss Universe pageant in Moscow. Mr. Trump met more than a dozen of the country’s most prominent oligarchs while he was there, Bloomberg News reported. Jared Kushner, who is married to Ivanka Trump and is a senior adviser to the president, has also been caught up in the Russia story. During the transition, Mr. Kushner met with the Russian ambassador, Sergey Kislyak, as well as with the top executive of a Russian government-owned bank.