WASHINGTON — The Senate Intelligence Committee has asked a number of high-profile Trump campaign associates to hand over emails and other records of dealings with Russians as part of its investigation into Russian meddling in the presidential election and is prepared to subpoena those who refuse to cooperate, officials said.

The requests for the materials were made in letters sent by the committee in the past 10 days, said two officials with knowledge of the contents of the letters. The move is designed to accelerate the committee’s investigation, and represents a new bipartisan challenge to the Trump administration, which has sought to use Republican allies in Congress to blunt the inquiries.

Among those who said they had received the requests were Roger J. Stone Jr., an informal adviser to President Trump, and Carter Page, a businessman and former foreign policy adviser to the Trump campaign. Paul Manafort, the former campaign chairman, and Michael T. Flynn, the former national security adviser, were also sent letters, the officials with knowledge of the investigation said. Representatives for those two men declined to comment.

