WASHINGTON -- A conspiracy theorist from New Jersey who helped peddle the falsehood that Barack Obama was foreign-born has been subpoenaed in the investigation into whether President Donald Trump's campaign colluded with Russia, according to a published report.

The New York Times said Jerome Corsi of Denville, who formerly worked for the Infowars website that claimed 9/11 was a hoax and the mass murder of elementary school students in Newtown, Connecticut, never occurred, will testify on Friday.

Corsi has ties to Roger Stone, a former Trump adviser, and possibly had advance knowledge that Wikileaks had hacked into Hillary Clinton campaign chairman John Podesta's email and would release its contents.

"He fully intends to comply with the subpoena," Corsi's lawyer, David Gray, told the Times, saying they expected "it has to do with his communications with Roger Stone."

Stone has said he had no contact with Wikileaks founder Julian Assange and obtained his information elsewhere, including from public sources, the newspaper said.

Trump, who has praised Infowars founder Alex Jones, reportedly received information from Corsi before launching his evidence-free campaign insisting that Obama was not born in Hawaii. Corsi wrote a book on the subject.

Trump later admitted that Obama had been a native-born American and then falsely blamed Clinton for spreading the lie.

The president has railed against special counsel Robert Mueller, calling his investigation a witch hunt despite the fact that he has indicted or secured guilty pleas from 32 people and three companies, including Trump's former campaign chairman, Paul Manafort, according to Vox.

Jonathan D. Salant may be reached at jsalant@njadvancemedia.com. Follow him on Twitter @JDSalant or on Facebook. Find NJ.com Politics on Facebook.