The U.S. government made it tougher on Wednesday for Americans to book trips to and do business with Cuba, making good on a pledge by President Donald Trump to roll back his Democratic predecessor¡¯s move toward warmer ties with Havana.

The restrictions, which take effect on Thursday, are aimed at preventing the military, intelligence and security arms of Cuba¡¯s communist government from benefiting from American tourists and trade, the White House said.

They fill in the regulatory detail on a Trump policy speech in June, in which the Republican president called for a tightening of restrictions. Trump said then that the Cuban government continued to oppress its people and former President Barack Obama had gone too far in a 2014 diplomatic breakthrough with Washington¡¯s former Cold War foe.