An Australian man from Melbourne could face prison in the United States after allegedly assaulting a federal officer at Los Angeles International Airport (LAX).The 35-year-old was travelling on a domestic flight from Los Angeles to Las Vegas, when he allegedly approached a uniformed Transport Security Administration (TSA) officer who was exiting the bathroom.It is alleged he approached the officer and accused them of stealing his backpack and passport, before he grabbed the agent by the shirt and pulled their lanyard