Because he doesn't want The NFL to lose its non-profit status.
Wait a minute. Barky is no longer Preezy.
Yank The NFL's non-profit status, President Trump!
It’s not non-profit status. I guarantee the owners make plenty of profit. It exemption from antitrust laws.
Congress through legislation has allowed pro sports to be a legal monopoly.
Maybe that shouldn’t be the case! Anyway Trump can’t do it with an EO. It would require legislation.