In a statement, the congressman said he expects the Ethics Committee to dismiss the matter.
"My office is aware of and is cooperating fully with the Ethics Committee’s preliminary inquiry into an FEC reporting error," Stockman said. "I thus join 34 of my colleagues who have also been the subject of an [Office of Congressional Ethics] review in the 113th Congress, and am confident the Ethics Committee will ultimately dismiss the matter after it completes a careful review."
Two Stockman aides were fired in October after they made prohibited donations to his campaign, the Houston Chronicle reported. Stockman later announced he wouldn't run for reelection to his seat and would instead challenge Cornyn for the Republican Senate nomination, which he lost by 40 points in March.