The United States has chosen David Brat as their new Australian ambassador ahead of a key anniversary between Australia and its allies.. The United States has chosen David Brat as their new Australian ambassador ahead of a key anniversary between Australia and its allies.. Credit: News Corp AustraliaThe United States has chosen David Brat as their new Australian ambassador ahead of a key anniversary between Australia and its allies. Dr Brat, a former Republican congressman, was confirmed to fill the role of Australian ambassador on Friday afternoon (AEST Saturday) after the role had been left empty for almost two years. I understand that the president will put forward David Brat as ambassador, and there’s a process of confirmation that occurs through the US processes.” “I welcome US President Donald Trump’s nomination of former congressman, David Brat, to serve as America’s next ambassador to Australia,” he wrote in a post to X.