http://www.espn.com/soccer/fifa-world-cup/story/3400487/united-states-led-2026-world-cup-bid-in-jeopardy-to-morocco-sourcesNot just the current administration's immigration policies (or the President trashing other countries), but also the FBI investigation into FIFA which took down many South American executives.
According to the article, Morrocco's bid is being heavily supported by Asia, Africa, and South America, while the U.S. bid, which is joint with Canada and Mexico, is being supported by most of Europe, the Oceanias, the rest of North America (since the 3 hosts can't vote), and some Asian countries.
It really seems odd to me that South America wouldn't support a North American bid, especially since 2026 is the first year the field expands to 48 teams and the U.S. (along with Canada and Mexico) is one of the few countries that can easily support an expanded field. And I could totally understand if a place like England or Germany was the other country, but Morocco is just a strange bed fellow for the world to die on.