Sen. Bernie Sanders underwent heart surgery after he experienced chest discomfort during a campaign event on Tuesday, his campaign said. Jeff Weaver, a senior adviser to Sanders's campaign, said a medical evaluation of the Vermont senator discovered blockage in one of his arteries, and two stents were successfully inserted. "Sen. Sanders is conversing and in good spirits," Weaver said. "He will be resting up over the next few days. We are canceling his events and appearances until further notice, and we will continue to provide appropriate updates."

https://www.washingtonpost.com/politics/2019/10/02/4bf1660a-e522-11e9-a331-2df12d56a80b_story.html