Stein, a Lexington physician, was present at a 2015 dinner in Moscow that was also attended by Trump’s former national security adviser, Michael Flynn, whose contacts with Russian officials have been a chief focus of investigations. Flynn and Stein sat with Russian President Vladimir Putin.

Senator Richard Burr, Republican of North Carolina, said Monday the Senate committee has started looking into Stein’s campaign. Burr had indicated previously the committee is also looking into reports the Democratic National Committee paid for research that went into a dossier detailing allegations of Donald Trump’s exploits in Moscow.

WASHINGTON — The Senate Intelligence Committee is looking at the presidential campaign of the Green Party’s Jill Stein for potential collusion with Russians, a sign that the panel’s probe is far from over, even as allegations swirl that the House panel’s investigation is racing to a close.


The expansion of the investigation to include Stein suggests that the Senate intelligence probe it will continue well into next year. That stands in contrast to the House, where Democrats have been charging that Republicans are pushing the House Intelligence Committee to finish up its investigation by the end of this year — before, Democrats say, it can be responsibly completed.

The House Intelligence Committee this week has or is scheduled to interview a number of high-profile witnesses, including: Rob Goldstone, the music producer who helped set up a meeting with a Russian lawyer at Trump Tower in June 2016; Andrew McCabe, the deputy director of the FBI; Felix Sater, a Russian-born businessman who was a close associate of Trump’s; and Rhona Graff, Trump’s longtime aide and often referred to as the ‘‘gatekeeper’’ for Trump Tower. The interviews of Graff and Sater are expected to take place in New York — another sign, Democrats say, that House Republicans are rushing.


Burr pushed back Monday on reports that the House Intelligence Committee would soon shut down its probe.

‘‘I've heard the House guys actually say that’s not true,’’ Burr said.

Representative K. Michael Conaway of Texas, who is running the House’s investigation, would not answer questions Monday about the probe’s timing, even as he confirmed the Goldstone and McCabe interviews. Conaway said he would not be attending this week’s interviews in New York.