New embassy?
A trade agreement?
Double mileage points?
Retrieve his Vietnam medals?
Ketchup stand?
Sell his book?
Waste taxpayers money?
Star in a movie with Leonardo Di Craprio?
Establishing diplomatic relations with the Emperor Penguins?
Colluding with Russians or Ukrainians?
Meeting with Russians or Chris Steele?
I don’t know why he went, but leaders from all over the world have been going there. WikiLeaks had a bunch of pics of Antartica released. Something secret there - maybe we will find out one of these days.
Part of Admiral Byrd’s expedition is still classified is what I’ve read. He went there after WWII, possibly looking for Nazi Bases.