At least three high-profile Trump associates have been asked to fork over emails and other communications with Russians in the next step of a broad Senate Intelligence Committee investigation into Kremlin meddling in the U.S. presidential election. The requests were sent over the past 10 days, opening up a path for the committee to subpoena the information from anyone who refuses to comply. Republican Senator Richard M. Burr, chairman of the committee, said in the letters that he is prepared to force those invovled to turn over their records, if it comes to that. Roger Stone, informal adviser to the president, said he was among those who received the requests. Carter Page, Paul Manafort, and Michael Flynn also received the requests, according to The New York Times. Stone told newspaper that he intended to comply with the request. “I am eager, indeed anxious, to testify in full public session, have requested no immunity and am ready to go,” he said.