Special counsel Robert Mueller's investigators are exploring Ivanka Trump's potential contacts with Russians attending a key June 9, 2016 meeting in Trump Tower.

The Los Angeles Times reports that Ivanka Trump, who did not attend the meeting, spoke at the elevator with Russian lawyer Natalia Veselnitskaya and Russian-American lobbyist Rinat Akhmetshin.

Mueller has recalled at least one of the meeting's participants for further questioning.

"Even if you thought that this [meeting] was not treasonous, or unpatriotic, or bad ..., and I happen to think it's all of that, you should have called the FBI immediately," Steve Bannon said in the new Michael Wolff book, Fire and Fury.

"The chance that Don Jr. did not walk these jumos up to his father's office on the twenty-sixth floor is zero," Bannon concluded.

Veselnitskaya, Akhmetshin, translator Anatoli Samochornov and Ike Kaveladze attended the meeting with Paul Manafort, Donald Trump Jr. and Jared Kushner.

"Some defense lawyers involved in the case view Mueller's latest push as a sign that investigators are focusing on possible obstruction of justice by Trump and several of his closest advisors for their statements about the politically sensitive meeting, rather than for collusion with the Russians," the LA Times explained.