Donald Trump Jr.'s appearance before the Senate Judiciary Committee will probably focus on a meeting he had with a Russian lawyer and others during the final stretches of last year's campaign.
Emails released in July show that Trump Jr. Was told the session at Trump Tower in New York was part of a Russian government effort to aid his father, the Republican nominee.
Special counsel Robert Mueller is investigating that meeting, also attended by Trump's son-in-law, Jared Kushner, and then-campaign chairman, Paul Manafort. A grand jury has heard testimony about it.
"We want to do this in a thorough way that gets the most information possible," Warner said.
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Separately, former President Barack Obama's national security adviser, Susan Rice, was meeting yesterday with the House Intelligence Committee, according to a person familiar with the interview. This person wasn't authorized to discuss the committee's confidential work and spoke on the condition of anonymity.
As for Donald Trump Jr., some Democratic senators said they planned to attend his session though tradition dictates that senators cannot ask questions at such interviews conducted by committee staff.
Sens. Richard Durbin, D-Ill., and Richard Blumenthal, D- Conn., said they would be there. Sen. Chris Coons, D-Del., was considering it.
"I go in with an open mind," Durbin said. "I want to hear his answers to questions there are plenty of questions - about the involvement of the Trump corporation as well as the Trump campaign with the Russians and other foreigners, and I just want to hear what Mr. Trump has to say."
"The critical part of his testimony will be following the financial dealing," Blumenthal said. He said he also wants to find out what Trump Jr. May know about potential obstruction of justice, adding there may have been conversations between the two about the firing of FBI Director James Comey and other matters.
Blumenthal and Coons said the private interview is no substitute for a public hearing, which the committee chairman, Sen. Chuck Grassley, R-Iowa, has promised will happen.
"This meeting is far less important than his public testimony, under oath, before the American people," Blumenthal said.
Meanwhile, the Justice Department is reviewing subpoenas from the House intelligence committee.
In a letter on Friday that was obtained by the AP, the committee wrote that it had served subpoenas on Aug. 24 to the department and the FBI for documents related to the committee's investigation of Russian meddling. The Justice Department and FBI had missed the original Sept. 1 deadline, so the committee extended the deadline to Sept. 14.
The letter was signed by the committee chairman, Rep. Devin Nunes, R-Calif., who stepped back from the Russia investigation this year after he was criticized for being too close to the White House. Rep. Mike Conaway, R-Texas, took over the leading role, but his name does not appear on the letter.