Former Vice President Joe Biden on Tuesday suggested Congress might have to launch impeachment proceedings if President Trump blocks their investigations.

Biden spoke with Good Morning America about the release of Special Counsel Robert Mueller's report, saying parts of it are "left undone" and that Congress must investigate.

"And if, in fact, they block the investigation, they have no alternative than to go to the only other constitutional resort they have, [which] is impeachment," Biden said.

For now, Biden said his job is to "make sure [Trump is] not back as president of the United States of America."

Prior to the release of the Mueller report, Biden had said Democrats should not impeach Trump, saying in October, "I hope they don't. I don't think there's a basis for doing that right now," Politico reports.

But while Democratic leaders had held off on calling for impeachment after the release of the Mueller report, The Washington Post on Monday reported that the Trump administration's lack of cooperation with their investigations, including Attorney General William Barr's threat not to show up to testify before Congress, some Democrats are beginning to rethink that — and it sounds like Biden may be one of them. Brendan Morrow