British publicist Rob Goldstone in an interview published Monday said that members of the Trump campaign who attended a meeting he facilitated between them and a Russian lawyer should have known the gathering was improper.

"People have said to me, 'Shouldn't I have known?' Well, shouldn't they have known? I know nothing about politics, I set up a meeting. Shouldn't they have known?" Goldstone told NBC News.

When asked whether he regrets his role in the meeting, Goldstone said he did and wished he had not set it up.

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“I regret not listening to the little voice in my head,” Goldstone said. “The same one that made me say to [his client, Russian pop star] Emin, ‘No good can come from this and this is a bad idea.’ ”

Goldstone acknowledged to the news outlet that he conveyed a "dirty offer" to members of the Trump campaign when discussing the possible June 2016 meeting at Trump Tower, but noted that the damaging information that was promised on Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE "didn't materialize."

The publicist told NBC News that he believes it's possible the meeting may have been a setup by Russian intelligence officials.

"I'm willing to believe that I don't know who wanted this meeting," Goldstone said.

The Trump Tower meeting has become a flashpoint in special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's investigation into Russian interference in the 2016 election.

Goldstone says he discussed the details of the meeting with Mueller in March. He also told NBC that he discussed his time with President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE during a Moscow visit in 2013.

Trump admitted on Twitter last month that the meeting was intended to gather information on Clinton, despite his son's previous claims that it was focused on Russian adoption policy related to American sanctions.

Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE, who welcomed the offer of the meeting and later attended it, has downplayed its significance and called it a "waste of time."

The president has denied he had any advance knowledge that the meeting was taking place.