But I do think a decent President could repair the damage, but that would require a true leader, diplomacy, apologies and more. Only US Presidents I can think of, though, that could 'pull this off'? Washington, Lincoln, or Obama. Nobody in the world respects Trump except MAGA idiots.
If Barack Obama visited Australia, he would be treated with courtesy and respect. If Donald Trump visited Australia, he would have eggs thrown at him. Read about (search) "tall poppy syndrome" then think about Trump.
In Australia and New Zealand we "cut down tall poppies to size" We don't worship them, start buying their merch, MAGA hats and gold shoes, etc. We cut them down to size. That's why Trump wouldn't last a day down under or across the ditch. Act like you're 'above everyone else's station' here ...