Last year Larry Pascal, the Dallas-based head of Haynes and Boone‘s Americas practice, helped American Airlines begin offering flights from New York to Havana, connecting through Miami, now for under $1,100 round trip.

But President Donald Trump, if reports are accurate, may announce in Florida on Friday a significant tightening of the travel restrictions that his predecessor relaxed—making it more difficult for U.S. citizens to visit Cuba and potentially undoing some of Pascal’s work.