According to a statement, Kirk, 52, checked himself in to Lake Forest Hospital in the Chicago area on Saturday, where doctors discovered a carotid artery dissection in the right side of the neck.
After being transferred to
On Monday, Kirk underwent "successful" surgery to relieve swelling around his brain that resulted from the stroke, the statement continues.
"Due to his young age, good health and the nature of the stroke, doctors are very confident in the senator's recovery over the weeks ahead," Kirk's office said.
His doctors are expected to provide more details at a news conference shortly.
In Kirk's office in the Hart
Kirk captured President Obama's old U.S. Senate seat in a close 2010 election against Democrat
His victory capped a tumultuous political fight that began when former Gov.
During 10 years in the U.S. House before his Senate election, Kirk has forged a reputation as a centrist Republican.
He has sought to maintain that reputation amid the bitter partisan atmosphere in Washington, including working with Democratic Majority Leader
Kirk, who lives in