According to U.S. media reports on July 27, local time, the U.S. Department of Justice is investigating former President Trump over the riots on Capitol Hill on January 6 last year.
Federal prosecutors are reportedly investigating communications between Trump and those close to his reelection campaign.
Witnesses called by a federal grand jury included two advisers to then-Vice President Mike Pence.
It is unclear whether Trump himself is the target of the investigation, but prosecutors are asking questions about Trump and his aides.
(Headquarters reporter Zhang Yingzhe)