US federal officials say they have opened an investigation into former special counsel Jack Smith, who led two federal criminal cases against President Donald Trump before resigning from his post earlier this year.
The Office of the Special Counsel (OSC) confirmed to the BBC that an investigation into Mr Smith is underway, but declined to add further details.
Mr Smith was appointed as special counsel in 2022 to investigate Trump's alleged mishandling of classified documents and his alleged attempt to interfere in the 2020 election.
The OSC does not have authority to lay criminal charges against Mr Smith, but it can initiate disciplinary action or refer its findings to the Department of Justice.
US media reported on Saturday that the OSC is investigating Mr Smith for alleged violations of the Hatch Act, a law that prohibits political activities by government officials.
