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

Former Vice President Joe BidenJoe BidenRepublicans consider skipping witnesses in Trump impeachment trial Trump trade deal likely to sow division in Democratic presidential field Trump supporters at Pa. rally 'upset' after Democrats introduce impeachment articles 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 MuellerTrump says he'll release financial records before election, knocks Dems' efforts House impeachment hearings: The witch hunt continues Speier says impeachment inquiry shows 'very strong case of bribery' by Trump 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 TrumpRepublicans consider skipping witnesses in Trump impeachment trial Bombshell Afghanistan report bolsters calls for end to 'forever wars' Lawmakers dismiss Chinese retaliatory threat to US tech MORE if he were to block a congressional investigation into whether he obstructed justice by firing former FBI Director James ComeyJames Brien ComeyMisfired 'Hurricane': Comey's team abused Carter Page and the FBI Trump rebukes FBI chief Wray over inspector general's Russia inquiry The Hill's Morning Report - Sponsored by AdvaMed - Democrats to release articles of impeachment today 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 HarrisPoll: Buttigieg slips into fourth place as Biden widens lead Yang qualifies for December Democratic debate The media have fallen out of love with Bernie, but have voters? 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.