Several members of the House and Senate are expected to participate, plus a bevy of consultants and veteran power brokers, the people said, requesting anonymity to discuss the session.
Sen. Jeff Sessions (R-Ala.), the populist-right favorite who endorsed Trump last month, and Trump campaign counsel Donald F. McGahn organized the meeting along with Trump's advisers. The venue will be McGahn's law firm, Jones Day, which is a short walk from the Capitol.
When asked Saturday about the meeting, Trump campaign manager Corey Lewandowski confirmed that the candidate would meet privately with Republicans ahead of his speech Monday to the American Israel Public Affairs Committee's policy conference in Washington. He declined to provide a list of attendees.
"Mr. Trump is continuing his outreach to Washington and there has been an overwhelming positive response," Lewandowski said in a brief phone interview.
The people invited to attend both said they were told that the meeting would be focused on "party unity" and intended to help Trump get to know more elected leaders and other players, including some Republicans who have not endorsed the billionaire mogul.