What does it mean for the FBI to investigate Trump’s campaign and Russia?

As President Trump faces growing pressure from Congress and the Justice Department to release his tax returns, the FBI is investigating Russia’s attempts to influence the 2016 presidential election.

A senior official told CBS News that the FBI has been “fully engaged” in the investigation.

The FBI director, James Comey, told Congress in January that his agency has “serious concerns” about Russia’s alleged efforts to influence US elections and that “there is significant evidence” that Russia tried to influence them.

And just last week, the House Intelligence Committee held a hearing on Russian interference in the 2016 election and the potential for “collusion” between Trump’s associates and Russia.

In an email to CBS News, the Trump campaign, in an email, called Comey’s comments “ridiculous and completely false.”

In an interview with ABC News, Trump said, “We have no collusion with Russia.”

“We do not know anything,” Trump said.

“If you look at what I said last night, I’m not going to discuss it, I won’t say it, but I’m gonna say it.”

Asked if he thinks his campaign was colluding with Russia, Trump told ABC News’ George Stephanopoulos: “I do not think so.”

“You can ask anybody,” he added.

“I have no idea.

And I’ve told you that to many reporters.

And that I think there’s no collusion.

And frankly, I don’t think there is.”

Asked by ABC News if he believes the FBI and the justice department should release the tax returns to Congress, Trump replied: “Well, I have to say, I really don’t know.”

“I’ve given you plenty of opportunity, George, to do so, George.

But I don, and I’ve given it plenty of time, George,” Trump added.

But he added: “We’re not gonna discuss it.

We’re gonna go on with our lives.

But the American people are entitled to know.

They’re entitled to the answers.”

Trump is under intense pressure to release the returns, and the president has suggested that he will if he wins reelection.

The White House has also argued that he should release them to help him avoid a potential criminal investigation by the Justice and Treasury departments.