The Senate Intelligence Committee has asked at least four associates of President Trump to turn over emails and recordings of their communications with Russians, as the committee investigates allegations that Russia meddled in the 2016 election. The four officials are former policy adviser Carter Page, former Trump campaign chair Paul Manafort, Republican operative and Trump associate Roger Stone, and Michael Flynn, who was fired as national security adviser in February for failing to disclose talks with Russia’s ambassador before Trump took office. Meanwhile, former acting U.S. Attorney General Sally Yates will testify to the committee today, where she’s expected to reiterate that she warned the White House about former National Security Adviser Michael Flynn nearly three weeks before he was fired. Former Director of National Intelligence James Clapper will also testify.