A prominent Russian-American lobbyist and former Soviet military officer attended a meeting with President Donald Trump's son, son-in-law and campaign chairman last year, the lobbyist said Friday, adding a new wrinkle to the Trump team's evolving explanations about the June 2016 session.

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 co-ordinated 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 agencies, a characterization he dismisses as a "smear campaign." He's a well-known Washington presence, lobbying for Russian interests and trying to undermine the allegations of lawyer Sergei Magnitsky, who died in a Russian prison and is the namesake of a U.S. sanctions law.

Akhmetshin told the AP he served in the Soviet military in a unit that was part of counter-intelligence but he was never formally trained as a spy.

Russian-American lobbyist Rinat Akhmetshin says he was at the meeting. U.S. media reported Akhmetshin was as a former Soviet counterintelligence officer, but he denies those assertions. (Radio Free Europe/Radio Liberty via AP)

In emails posted by Donald Trump Jr. earlier this week, a music publicist said he arranged the meeting because a Russian lawyer wanted to pass on negative information about Clinton. The go-between stated that the discussion was part of a Russian government effort to help the Republican candidate.

While Trump Jr. has confirmed that Russian attorney Natalia Veselnitskaya was in the meeting, he has not disclosed Akhmetshin's presence. The president's son has publicly discounted the meeting, saying he did not receive the information he was promised.

In a statement Sunday, Trump Jr. said the attorney had said she had information that people tied to Russia were funding the Democratic National Committee and supporting Clinton, a description that Akhmetshin backed up in his interview with the AP.

In his first public interview about the meeting, Akhmetshin said he accompanied Veselnitskaya to Trump Tower where they met an interpreter. He said he had learned about the meeting only that day when Veselnitskaya asked him to attend. He said he showed up in jeans and a T-shirt.

Veselnitskaya brought with her a plastic folder with printed-out documents that detailed what she believed was the flow of illicit funds to the Democrats, Akhmetshin said. Veselnitskaya presented the contents of the documents to the Trump associates and suggested that making the information public could help the campaign, he said.

"This could be a good issue to expose how the DNC is accepting bad money," Akhmetshin recalled her saying.

Trump Jr. asked the attorney if she had sufficient evidence to back up her claims, including whether she could demonstrate the flow of the money. But Veselnitskaya said the Trump campaign would need to research it more. After that, Trump Jr. lost interest, according to Akhmetshin.

"They couldn't wait for the meeting to end," he said.

Here's my statement and the full email chain <a href="https://t.co/x050r5n5LQ">pic.twitter.com/x050r5n5LQ</a> —@DonaldJTrumpJr

Akhmetshin said he does not know if Veselnitskaya's documents were provided by the Russian government. He said he thinks she left the materials with the Trump associates. It was unclear if she handed the documents to anyone in the room or simply left them behind, he said.

Jared Kushner, Trump's son-in-law and current White House senior adviser, and then-campaign chairman Paul Manafort also attended the meeting. Akhmetshin said he recognized Kushner and Trump Jr. He also said he recognized Manafort because they worked in "adjacent political circles" but never together.

Others in the room

He said there were others in the room but he didn't know them. Publicist Rob Goldstone, who brokered the meeting via email with Trump Jr., has told the AP that he was there.

Donald Trump Jr.'s lawyer, Alan Futerfas, told NBC News two other people were with Veselnitskaya at the meeting — a translator and a friend of Emin Agalarov and "maybe as a friend of Natalia," the Russian lawyer.

Futerfas told NBC News that individual told him he is a U.S. citizen. "He told me specifically he was not working for the Russian government, and in fact laughed when I asked him that question," NBC quotes Futeras.

The network said it was not clear whether Futerfas was referring to Akhmetshin.

U.S. President Donald Trump's son Donald Jr., son-in-law Jared Kushner and then campaign chairman Paul Manafort attended a June 2016 meeting at Trump Tower that was billed as part of a Russian government effort to help the Republican campaign. (Mark Lennihan/Associated Press)

Asked about Akhmetshin's participation, Manafort spokesman Jason Maloni declined comment. Trump Jr.'s attorney did not respond to inquiries, nor did a spokesman for Kushner. Veselnitskaya has denied having any ties to the Russian government. When reached by the AP this week, she declined comment. She did not respond to additional attempts to contact her Friday.

'Consistent dissembling and deceit'

The confirmation of Akhmetshin's participation in the meeting drew swift reaction from the top Democrat on the House intelligence committee.

Adam Schiff of California said whether Akhmetshin is connected to Russian intelligence or not "it is clear the Kremlin got the message that Donald Trump welcomed the help of the Russian government in providing dirt on Hillary Clinton." Schiff said Trump Jr.'s omission of Akhmetshin's role in his public account of the meeting and the president's son's shifting explanations "paint a portrait of consistent dissembling and deceit."

Kushner disclosed the meeting on his security clearance paperwork, but Schiff said the Akhmetshin revelation raises questions about how much Kushner disclosed about it. He said he believes Kushner's clearance should be reviewed, and "if he was not perfectly candid," the clearance should be revoked.

Akhmetshin, who spoke to the AP while on vacation in France where he said he has been surfing, said the meeting was "not substantive" and he "actually expected more serious" discussion.

"I never thought this would be such a big deal to be honest," he said.

The Russian government has denied any involvement or knowledge of the June 2016 meeting. Asked Friday about Akhmetshin, Russian President Vladimir Putin's spokesman, Dmitry Peskov, told reporters: "We don't know anything about this person."

Akhmetshin's background

Akhmetshin has been identified in media reports as a former officer in Russia's military intelligence service known as the GRU. He has denied that, saying he served in the Soviet Army from 1986 to 1988 after he was drafted but was not trained in spy tradecraft. He said his unit operated in the Baltics and was "loosely part of counterintelligence."

Akhmetshin said he has not been contacted by the U.S. special counsel's office or the FBI about the meeting with Trump Jr. He said he's willing to talk with the Senate Judiciary Committee, whose chairman has pressed the Justice Department about why Akhmetshin has not registered as a foreign agent.

The chairman, Republican Chuck Grassley of Iowa, said in a March 31 letter, "Mr. Akhmetshin is a Russian immigrant to the U.S. who has admitted having been a 'Soviet counterintelligence officer.'" Grassley also wrote that Akhmetshin has a long history of pro-Russia lobbying.

Senate Judiciary Committee Chairman Sen. Chuck Grassley, R-Iowa listens on Capitol Hill in Washington, July 12. In March, Grassley wrote that Akhmetshin has admitted serving as a Soviet counterintelligence office and has a long history of pro-Russia lobbying. (Pablo Martinez Monsivais/Associated Press)

Akhmetshin said that the Justice Department's Foreign Agents Registration Act unit sent him a letter in April and told him, "it has come to our attention you should have filed for FARA." He said he didn't believe he needed to file. He has previously registered with Congress for the lobbying work, and he plans to raise this issue before Grassley's committee.

"I think I have a legal right to tell my story," he said.

Journalist Steve LeVine wrote in 2007 in his book, The Oil and the Glory, that, as a lobbyist, "armed with a seemingly bottomless expense account and a sheaf of inside documents, the skilled Akhmetshin burrowed in with Washington reporters, think tank experts, administration bureaucrats, and key political figures."

Separately on Friday, the data and digital director for Trump's presidential campaign said he will speak with the House Intelligence committee later this month as part of its own Russia probe.

Brad Parscale said in a statement that he is "unaware of any Russian involvement" in the data and digital operations but will voluntarily appear before the panel.