Rep. Eric Swalwell (D-CA) appeared on Tucker Carlson Tonight on Monday for a contentious debate over the basis for the investigation into whether President Trump's campaign colluded with Russian meddling during the 2016 election. Host Tucker Carlson asked how Swalwell would feel about an informant reporting to the FBI about one of his political campaigns, referring to recent reporting that an FBI informant spoke to two Trump campaign advisers to ask about suspicious contacts.