Trump played a key role in destroying the USFL in the 1980s?
“The NFL would later introduce extensive evidence designed to prove that the USFL followed Trump’s merger strategy, and that this strategy ultimately caused the USFL’s downfall. The merger strategy, the NFL argued, involved escalating financial competition for players as a means of putting pressure on NFL expenses, playing in the fall to impair NFL television revenues, shifting USFL franchises out of cities where NFL teams played into cities thought to be logical expansion (through merger) cities for the NFL, and, finally, bringing an upcoming antitrust litigation..”
https://www.law.berkeley.edu/sugarman/Sports_Stories_USFL_v_NFL__-_Boris_Kogan.pdf