Former US Vice President Donald Trump, Mike Pence, was summoned to investigate and testify about the attack on the Capitol in January 2021, by Trump supporters.
ABC said that Pence's summons was decided after months of negotiations between federal prosecutors and Pence's legal team.
Pence's testimony could help reveal the extent of Trump's efforts to prevent the certification of his Democratic rival Joe Biden's victory in the 2020 presidential election.
Trump had publicly put pressure on Mike Pence not to certify the election results on January 6, 2021, when Congress was besieged by supporters of the former Republican president.
Dan Pence, who may run for the presidential elections in 2024, considered these actions "irresponsible" but refused to testify before the House of Representatives Inquiry Committee into the attack on the Capitol.
In addition to this investigation, Special Prosecutor Jack Smith, who was appointed by the US Attorney General last November, is overseeing a second investigation into the Trump administration, related to secret documents that were supposed to be kept in the archives after he left the White House.
Trump, who announced his candidacy for the 2024 presidential elections, may try to prevent the testimony of his former vice president by resorting to executive branch powers that allow his correspondence to be kept secret, as he tried to do with other officials whose names were mentioned in the federal investigation.
The special prosecutor will have to decide whether to recommend an indictment against the billionaire Republican, and it will be up to the attorney general to make the final decision.