Rinat Akhmetshin confirmed his involvement to The Associated Press in an interview. He had not been previously identified as a participant in the meeting at Trump Tower in New York, which was billed as part of a Russian government effort to help the Republican's White House campaign.

The meeting has heightened questions about whether Trump's associates coordinated with Russia to meddle in the presidential election — to help him and thwart Hillary Clinton — and whether they've been forthcoming about their foreign contacts. Federal and congressional investigators are probing possible connections between the campaign and Moscow.

Akhmetshin has been reported to have ties to Russian intelligence, a characterization he dismisses as a "smear campaign." He's a well-known Washington presence, lobbying for Russian interests trying to undermine the allegations of a lawyer who died in a Russian prison and is the namesake of a U.S. sanctions law.