I meant invade like if they invaded California and overthrew Gavin Newsom (this is not an endorsement of Newsom).

In our case, they'd enter parliament, arrest Albanese, and put Ralph Babet in charge. Probably after the Murdoch runs a whatsitcalled campaign to give plausible deniability to the Americans for doing this. Then again, the CIA has couped our leaders before (although I don't imagine the Americans will be satisfied with Sussan Ley or another ALP member in charge so they'd probably need to do a full military intervention).