On December 18, 2017, The Washington Post reported that the Senate Intelligence Committee was looking at Stein’s presidential campaign for potential “collusion with the Russians.” The Stein campaign released a statement stating it would work with investigators. The Committee cleared Stein of any collusion with Russia.
https://www.pbs.org/newshour/world/at-look-at-the-past-meetings-between-putin-and-american-presidents
https://en.wikipedia.org/wiki/Jill_Stein