After a long delay, American President Donald Trump has nominated Mike Waltz, his one-time national security advisor and focal point of the recent Signal chat debacle, as the next US ambassador to the United Nations. After Trump announced his nomination, a subdued Waltz wrote on X, "I'm deeply honored to continue my service to President Trump and our great nation." Waltz's nomination comes weeks after Trump pulled his initial nominee, Elise Stefanik - a Republican from rural upstate New York - for the post, sending the self-described "ultra-MAGA" Trump loyalist back to her seat in the American Congress to focus on domestic issues. Unlike Stefanik, Waltz, 51, will sit for his yet-to-be-scheduled Senate confirmation hearing for the ambassadorship, buoyed by decades of military experience as a Green Beret - an elite group of special forces in the US Army - as a former policy advisor in the Bush administration, the Pentagon - the headquarters of the US Department of Defense - and as a ...