NICK SCHIFRIN:

So, when we talk about the target of these probes, we have to know that the special counsel, Rob Mueller, is not talking.

So, we know this from the targets themselves. And target number one seems to be Paul Manafort, former chairman of the Trump campaign. And we know that FBI agents raided his home in late July, and reportedly a P.R. firm connected to him has also been subpoenaed.

Target number two, Michael Flynn, the retired general, former national security adviser, we know that a lobbying firm connected to him has been subpoenaed.

And target number three, Donald Trump Jr., the president's son, recently testified to Congress about a meeting he had in Trump Tower last summer that turned out to be with a Russian lawyer who has some vague connections to the Kremlin.

And in a statement from Donald Trump Jr. to Congress, he said: "I didn't collude with any foreign government and do not know of anyone who did," but he admitted that he was willing to collude — quote — "To the extent they had information concerning the fitness, character, or qualifications of a presidential candidate, Hillary Clinton, I believed I should at least hear them out."

And now certainly that meeting is part of the investigation.