It's safe to assume the Intelligence Committee is interested in anything pertaining to Stein's now-infamous attendance at a Gala for RT in Moscow, at which she was seated and photographed with Vladimir Putin and Michael Flynn.
Further, Stein warned against allowing the inquiry to become a frenzy and advocated for a contextual understanding of her interactions with Russian actors.
Stein has been a frequent guest on RT America to comment on events such as gun control, foreign policy, and environmental matters. Among them are Rob Goldstone, the music producer who helped set up a meeting with a Russian lawyer at Trump Tower in June 2016; FBI Deputy Director Andrew McCabe; Felix Sater, a Russian-born businessman; and Rhona Graff, Trump's longtime aide.
Stein has previously told the Intercept that she shook Putin's hand, but didn't interact with him much beyond that. In 2015, the Post reports, the Green Party candidate attended a dinner in Moscow that also included Michael Flynn, the former Trump national security adviser who pleaded guilty to lying to the Federal Bureau of Investigation about his contacts with Russian Federation on December 1. He is cooperating with special counsel Robert Mueller's probe into the Russian meddling and has pleaded guilty to a count of making false statements to Federal Bureau of Investigation agents. Additionally, Politico reported that at least one Facebook ad bought by the Republican government benefitted Stein in the 2016 election.
Kaspersky Lab asks court to overturn USA govt software ban
It came amid mounting concern among USA officials that the software could enable Russian espionage and threaten national security. DHS officials said they anxious it could allow Russian intelligence to access sensitive information on computers.
WikiLeaks released stolen emails from several Democratic officials during the campaign. Both Stein and Trainor made frequent appearances on the outlet during the 2016 USA election.
"[We] made the trip with the goal of reaching an worldwide audience and Russian officials with a message of Middle East peace, diplomacy, and cooperation against the urgent threat of climate change, consistent with long-standing Green principles and policies", Stein wrote on Facebook.
As the Senate investigation continues, the House intelligence committee is working to wrap up its own probe into the meddling early next year.
Stein's name has surfaced occasionally throughout the Russian Federation investigation.