Washington (CNN) Joe Biden argued in a new interview that Congress would have "no alternative" but to begin impeachment proceedings against Donald Trump if the President obstructed justice in the special counsel investigation.

The former vice president, however, stopped short of calling for the impeachment process to start immediately against Trump in an interview with ABC News that aired Tuesday.

Asked of his initial reaction to the report's findings, Biden said, "There was Russian interference — without any question."

He argued that special counsel Robert Mueller's report lays out "seven or eight things that are left undone" that Mueller felt "was not within his purview to investigate."

"The Congress is attempting to take that up, and what the Congress should do, and they are doing, is investigate that," Biden said. "If, in fact, they (Trump and associates) blocked the investigation, they (Congress) have no alternative, but to go to the only other constitutional resort they have is impeachment."

Read More