HAVANA, Cuba (AP) — The Trump Administration’s crackdown on business with Cuba’s communist government is causing unprecedented concern among European companies on the island, according to the European Union’s ambassador.

“There’s enormous worry,” Ambassador Alberto Navarro told The Associated Press.

“There are business people who’ve been here 20, 30 years, who’ve made bets on investing their financial resources in Cuba to stimulate commerce, tourism, international exchange, and many of them tell me that they haven’t lived through a similar situation,” Navarro said in an interview at the EU embassy Tuesday afternoon.

The Trump Administration announced last week that it would allow Americans to sue foreign companies whose partnerships with the Cuban Government make use of commercial and industrial properties confiscated from Americans in Cuba’s 1959 revolution. The measure also allows suits by the large number of Cubans who fled the island and later became Americans.

The first lawsuits can be filed starting May 2.

Navarro said the European Union will vigorously defend European companies doing business in Cuba in court and before the World Trade Organization.