Sen. Mark Kirk (R-Ill.) underwent successful gall bladder surgery Monday morning after complaining of stomach pains over the weekend, his office said.

The senator was admitted to a hospital north of Chicago on Saturday complaining of stomach pains. Doctors determined that he had gallstones and that his gall bladder needed to be removed. He is expected to make a full recovery, according to a statement released by his office.

The surgery comes at the end of an eventful year for Kirk, who made an emotional return to the U.S. Senate in January after suffering a stroke in early 2011. He has maintained an active schedule since his return and remains on course to seek reelection in 2016, aides say.