“We are cooperating by sharing all communications relevant to the committee’s mission,” Stein wrote in a Facebook post on Tuesday. “We support safeguarding our elections from interference, while at the same time we caution strongly against the targeting of political opposition.”

The committee is investigating whether there was Russian interference into the 2016 presidential election, and whether the Trump campaign was involved. Russia has consistently denied any interference in the election.

The committee is looking into Stein’s potential “collusion with Russia,” Senator Richard Burr (R-North Carolina) said Monday, according to BuzzFeed.  Burr had previously said the committee was also looking into reports the Democratic National Committee paid for research that went into a dossier containing allegations of Donald Trump’s alleged exploits in Moscow.

Stein’s former campaign manager told BuzzFeed he expects the committee will want to know more about the 2015 Gala dinner hosted by RT, celebrating its 10th anniversary in Moscow. Stein sat at the same table as Russian President Vladimir Putin and Michael Flynn, who briefly served as Trump’s national security adviser. Stein said she was not paid to attend the dinner and paid for her own travel costs.

“[We] made the trip with the goal of reaching an international 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.

Stein has been a frequent guest on RT America to comment on events such as gun control, foreign policy, and environmental matters. She notably made appearances during Third Party presidential debates hosted by the network during the 2012 and 2016 elections.  The only other US network to host third-party candidates was CNN, which organized a Libertarian town hall in June and a Green town hall in August.

Stein requested to speak to Putin, Russian Foreign Minister Sergey Lavrov. or someone in the Russian government to discuss her policies, but the request was not granted, she told the Intercept.

“We sought contact with every powerful world leader we had access to,” Stein said, adding that she was particularly interested in the Russian government’s involvement in the Syrian War.

Stein, and her vice president running mate Ajamu Baraka received about 1 percent of the popular vote in the 2016 election.

She cautioned that the Senate investigation is exercising “overreach, politicizing, and sensationalism” and that is “a danger to democracy, especially in the current climate of all-out war on our First Amendment rights.”

The expansion of the Senate Committee Intelligence investigation comes as the House panel’s investigation is finish up its probe.

The House Intelligence Committee is interviewing a number of high-profile witnesses this week, according to the Boston Globe. 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.