(CNN) - South Carolina Gov. Mark Sanford, already under fire for an extramarital relationship, should be impeached for abusing state finances, a Republican state senator said Monday.
Sen. David Thomas - the chairman of the Senate constitutional and administrative subcommittee - wrote to leaders of the Republican-controlled Senate, accusing the governor of violating state regulations.
The allegations involve flights he took to London, England, and China in 2006 and 2007 on state business. South Carolina requires the governor to charge the state the lowest rate available unless there are overriding circumstances, such as emergency travel.
"The two flights by Gov. Sanford were in violation of the South Carolina Code of Regulations," Thomas said in his letter. "The difference in price between the most economical and the more expensive price of the seats the governor chose is approximately $13,700."
Thomas said he thought the violations were enough to trigger impeachment proceedings.
"If I were in the House, the answer would be yes, I would be involved in the beginning of the impeachment process," he said. "I think there is enough data right now to take seriously a move toward impeachment. Is that sufficient for impeachment? That I don't know."