President Donald Trump has intentionally criticized the FBI, CIA, and the Department of Justice this year to delegitimize them, Rep. Jim Himes, D-Conn., said Thursday.

During an interview on CNN, Himes — a member of the House Intelligence Committee — was asked about the progress of the investigation that's looking at whether the Trump campaign colluded with Russia.

"The enemies of the United States, name them: North Korea, Iran, Russia. In their wildest dreams, they would never imagine the president of the United States would tar and eviscerate the FBI, the DOJ, the CIA," Himes said.

"These are all institutions that our enemies hate because they keep us safe, because they do the hard work of American national security, and the president, since he became president a year ago, has gone out of his way to damage not just the morale, but the standing of these institutions in the American people's mind."

Hines said it's difficult to determine how much longer the House Intelligence Committee's Russia investigation will last because there is still a lot of information to look at.

"It's hard to say because there are, of course, probably dozens of witnesses that we still want to interview," he said.

"It's hard to say because, I say it as one of the members of the committee, we are occasionally surprised by things that [special counsel] Robert Mueller uncovers … We've got a ways to go. This is an investigation that needs to be done right, not done quickly."