Former Vice President Mike Pence appeared on Thursday before the grand jury hearing evidence about former President Donald J. Trump’s efforts to cling to power after he lost the 2020 election, a person briefed on the matter said, testifying in a criminal inquiry that could shape the legal and political fate of his one-time boss and possible 2024 rival.
Mr. Pence spent more than five hours behind closed doors at the Federal District Court in Washington in an appearance that came after he was subpoenaed to testify before the grand jury earlier this year.
As the target of an intense pressure campaign in the final days of 2020 and early 2021 by Mr. Trump to convince him to play a critical role in blocking or delaying congressional certification of Joseph R. Biden Jr.’s victory, Mr. Pence is considered a key witness in the investigation.
Mr. Pence, who is expected to decide soon about whether to challenge Mr. Trump for the 2024 Republican presidential nomination, rebuffed Mr. Trump’s demands that he use his role as president of the Senate in the certification of the Electoral College results to derail the final step in affirming Mr. Biden’s victory.