“During a campaign event yesterday evening, Sen. Sanders experienced some chest discomfort. Following medical evaluation and testing he was found to have a blockage in one artery and two stents were successfully inserted. Sen. Sanders is conversing and in good spirits. He will be resting up over the next few days,” said Sanders’ senior adviser Jeff Weaver on Wednesday in a statement. “We are canceling his events and appearances until further notice, and we will continue to provide appropriate updates.”

ABC News first learned from officials about the Vermont senator being hospitalized after his plans to attend a presidential gun forum changed. He is one of three septuagenarians in the Democratic primary, and the oldest.