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

Former Vice President Joe BidenJoe BidenTop adviser on Sanders: 'He's always been underestimated' 'The Simpsons' pokes fun at Trump's feud with 'the squad' 'Forever war' slogans short-circuit the scrutiny required of national security choices 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 MuellerMueller report fades from political conversation Trump calls for probe of Obama book deal Democrats express private disappointment with Mueller testimony 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 Trump Former US ambassador: 'Denmark is not a big fan of Donald Trump and his politics' Senate Democrats push for arms control language in defense policy bill Detroit county sheriff endorses Booker for president MORE if he were to block a congressional investigation into whether he obstructed justice by firing former FBI Director James ComeyJames Brien Comey3 real problems Republicans need to address to win in 2020 Barr predicts progressive prosecutors will lead to 'more crime, more victims' James Comey shows our criminal justice system works as intended 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 HarrisSenate Democrats push for arms control language in defense policy bill Top adviser on Sanders: 'He's always been underestimated' 'The Simpsons' pokes fun at Trump's feud with 'the squad' 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.