Biden: If Trump blocks investigations, Congress has no choice but to impeach him

Former Vice President Joe BidenJoe BidenBiden bemoans white supremacy in remarks at civil rights movement site Gun control: Campaigning vs. legislating Sunday shows - Guns dominate after Democratic debate MORE said Tuesday that Congress should move forward with impeachment proceedings if the White House and Republicans work to block Democratic efforts to investigate matters "left undone" by special counsel Robert MuellerRobert (Bob) Swan MuellerFox's Cavuto roasts Trump over criticism of network Mueller report fades from political conversation Trump calls for probe of Obama book deal MORE's investigation.

In an interview with ABC's "Good Morning America," the 2020 presidential candidate said that Democrats would have "no alternative" but to impeach President TrumpDonald John TrumpHarris bashes Kavanaugh's 'sham' nomination process, calls for his impeachment after sexual misconduct allegation Celebrating 'Hispanic Heritage Month' in the Age of Trump Let's not play Charlie Brown to Iran's Lucy MORE if he were to block a congressional investigation into whether he obstructed justice by firing former FBI Director James ComeyJames Brien ComeyHouse Democrats seeking Sessions's testimony in impeachment probe Justice OIG completes probe on FBI surveillance of ex-Trump campaign aide Aggrieved Trump rips Dems for 'sad' impeachment effort MORE and attempting to fire Mueller.

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"There are elements of the report ... about seven or eight things that are left undone, he was not within his purview to investigate, he thought," Biden said of Mueller. "The Congress is attempting to take that up."

"If in fact they block the investigation, they have no alternative but to go to the only other constitutional resort they have, [which] is impeachment," he added. "But my job, in the meantime, is to make sure he's not back as president of the United States."

Biden's call for Congress to begin impeachment proceedings if the White House blocks its investigation falls short of the position of his fellow 2020 primary contender Sen. Kamala HarrisKamala Devi HarrisHarris bashes Kavanaugh's 'sham' nomination process, calls for his impeachment after sexual misconduct allegation Gun control: Campaigning vs. legislating Booker defends middle-ground health care approach: 'We're going to fight to get there' MORE (D-Calif.), who said at a town hall last week that Congress should begin impeachment proceedings now.

"We have very good reason to believe that there is an investigation that has been conducted which has produced evidence that tells us that this president and his administration engaged in obstruction of justice. I believe Congress should take the steps toward impeachment," she told a CNN town hall in New Hampshire.