The targeted lawmakers are former federal prosecutor Adam Schiff (D-CA), former state prosecutor Eric Swalwell (D-CA), and legendary survivor of the 1978 Jonestown massacre, Jackie Speier (D-CA).
Schiff is the ranking Democrat on the Intelligence Committee.
"To maintain the credibility of the investigation, this committee should determine whether any member or staff member violated the rules by leaking information to the media concerning the interview or by purposely providing inaccurate information which led to significant misreporting," Alan S. Futerfas, Mr. Trump's lawyer, wrote.
NY Magazine published the full content of the letter.
"After the Interview, the public release of confidential, non-public information by Committee members continued unabated. For example, that same evening and the following day, several members of the Minority, including Representatives Schiff, Speier and Swalwell, appeared on the news to discuss certain details of the Interview," the letter argued. "In an attempt to discredit my client, they did not accurately portray the breadth, scope and substance of the Interview."