Congressional investigators are questioning Donald Trump Jr. about Russian meddling in his father's presidential campaign past year, including a meeting the younger Trump held with a Kremlin-linked lawyer who purportedly was going to hand them "damaging information" about Democratic opponent Hillary Clinton.
Special counsel Robert Mueller is leading an investigation examining potential collusion with Russian Federation by the Trump campaign.
Investigators are focusing on a June 2016 meeting the younger Trump held in the midst of the campaign at Trump Tower in NY, the president's business and political campaign headquarters.
In a prepared statement obtained by The New York Times, Trump Jr. said he initially had reservations about the meeting with Natalia Veselnitskaya, a lawyer whom was described to him as a "Russian government attorney".
The June 2016 meeting at Trump Tower has been highly scrutinized since it was revealed earlier this year.
The Senate Judiciary Committee is getting the first crack at Trump Jr.
The interview on Thursday was expected to be largely handled by staff, though several senators said they planned to attend.
The staffers in question were aboard Air Force One when President Trump "was involved in the crafting of the statement".
As for his argument on the merits, for now, let's put aside the absurdity of Trump Jr. arguing that he felt the need to help evaluate Clinton's "fitness" for the presidency - as if this were somehow a credible rationale for cooperating with a foreign adversary.
Trump has denied the allegations. He had repeatedly said allegations of Russian connections to the USA election and the ensuing investigations are merely an excuse by Democrats to explain Trump's upset win over Clinton.
Here's what you need to know about the Senate investigators' interview with the president's eldest son - and what it could mean for the Russian Federation investigations going forward.
In addition to Trump Jr., former national security adviser Susan Rice will speak with lawmakers in Congress Wednesday morning, a source with direct knowledge told CNN.
He also said that he was skeptical about the meeting, which was organized by music publicist Rob Goldstone, but that nothing came of it. The interview was being conducted by staff, but a handful of Democratic senators attended.
Erin Pelton, a spokeswoman for Rice, said she had met voluntarily with the committee as part of its investigation.
Additionally, the Associated Press reports Trump Jr. also insisted he did not collude with the Russians.
Trump Jr. said he proceeded to "quickly and politely end the meeting".
Aides and committee members said Thursday's interview would attempt to clarify what happened before and after that email.
Committee members Sens. Christopher Coons, D-Del., Dick Durbin, D-Ill., Orrin Hatch, R-Utah, Amy Klobuchar, D-Minn., and Sheldon Whitehouse, D-R.I., were also seen entering or exiting the meeting.