ABC World News Tonight with David Muir Full Broadcast - July 17, 2024

Mary Bruce and Jonathan Karl have the latest on President Biden amid a White House announcement that he tested positive for COVID-19 and as Rep. Adam Schiff joins a growing list of Democrats calling for him to exit the race; Pierre Thomas reports on the shocking new timeline showing the shooter in that violent attack on Donald Trump was flagged as suspicious more than an hour before the assassination attempt; James Longman has the latest on the two Americans found dead following a suspected cyanide poisoning at a luxury Bangkok hotel; and more on tonight’s broadcast of World News Tonight with David Muir.