The subcommittee of the House Judiciary Committee is meeting Monday. If the panel approves a resolution calling for Mr. Sanford's ouster, the full committee could debate the measure next week.
The panel is also expected to release additional information received from several state officials. Lawmakers had requested answers about how Mr. Sanford communicated with his office during a five-day absence in June.
Mr. Sanford shocked the state when he returned, revealing a yearlong affair with a woman in Argentina. He will face several dozen state ethics charges on travel and campaign reimbursements during a hearing expected next year.