Joe Biden, 83, made a surprise visit to Trinity College Dublin with Jill Biden for a College Historical Society ceremony where Hunter Biden received the Gold Medal for Outstanding Contribution for Public Discourse; protesters gathered and threw objects as Biden departed, and Gardaí arrested at least two people. He also met Taoiseach Micheál Martin, revealed he was diagnosed with prostate cancer after leaving office, and said his memoir 'Promise Me, America' is his best way of explaining his presidency, including an excerpt recounting an unusual Oval Office meeting with Donald Trump.