A viral series of unsettling video clips of United States President Donald Trump has triggered internal alarm at the White House and drawn a vocal chorus of critics questioning his mental fitness.
President Trump, aged 79, who is serving his second term, has in recent weeks been seen in short-form social media videos in ways that some observers describe as erratic, incoherent, and unusual for a commander-in-chief, deepening concerns about his capacity to fulfil his constitutional duties.
