Jared Kushner
Jared KushnerReuters

Former US President Donald Trump's son-in-law, Jared Kushner, was among several witnesses to testify before a grand jury in recent weeks about Trump’s efforts to overturn the 2020 election, The New York Times reported on Thursday.

Sources told the newspaper that Kushner testified at a federal courthouse in Washington last month, and told the jury it was his impression Trump truly believed the 2020 election was stolen.

Special Counsel Jack Smith was appointed by Attorney General Merrick Garland last November to oversee over two Justice Department investigations involving Trump: His handling of classified documents, for which Trump has already been indicted and pleaded not guilty, and is an investigation into efforts to overturn the results of the 2020 US election that he Trump lost to Joe Biden.

A spokesperson for Smith's office declined to comment on The New York Times report. A representative for Kushner could not immediately be reached for comment.

In February, it was reported that Kushner and his wife, Ivanka Trump, had been subpoenaed by Smith to testify before a federal grand jury regarding the Jan. 6, 2021, attack on the Capitol.

Kushner previously appeared before the US House of Representatives committee which investigated Capitol riot, while Ivanka Trump met virtually with the committee for nearly eight hours, after the committee had asked for her cooperation in their probe.