MIAMI - President Donald Trump on Friday ordered tighter restrictions on Americans travelling to Cuba and a clampdown on US business dealings with the island’s military, saying “with God’s help a free Cuba is what we will soon achieve.”

As Trump laid out his new Cuba policy in a speech in Miami, the White House announced plans to roll back parts of former President Barack Obama’s historic opening to the communist-ruled country after a 2014 diplomatic breakthrough between the two former Cold War foes.

But Trump was leaving many of Obama’s changes, including the reopened US embassy in Havana, in place even as he sought to show he was making good on a campaign promise to take a tougher line against Cuba.

“We will not be silent in the face of communist oppression any longer,” Trump told a cheering crowd in Miami’s Cuban-American enclave of Little Havana, including Republican Senator Marco Rubio, who helped forge the new restrictions on Cuba. Trump’s revised approach, which will be enshrined in a new presidential directive, calls for stricter enforcement of a longtime ban on Americans going to Cuba as tourists and seeks to prevent US dollars from being used to fund what the new US administration sees as a repressive military-dominated government.

But facing pressure from US businesses and even some fellow Republicans to avoid turning back the clock completely in relations with communist-ruled Cuba, the Republican president chose to leave intact many of his Democratic predecessor’s steps towards normalization.

The new policy bans most US business transactions with the Armed Forces Business Enterprises Group, a Cuban conglomerate involved in all sectors of the economy, but makes some exceptions, including for air and sea travel, according to US officials. This will essentially shield US airlines and cruise lines serving the island.

However, Trump will stop short of breaking diplomatic relations restored in 2015 after more than five decades of hostilities. He will not cut off recently resumed direct US-Cuba commercial flights or cruise-ship travel, though his more restrictive policy seems certain to dampen new economic ties overall.

The administration, according to one White House official, has no intention of “disrupting” existing business ventures such as one struck under Obama by Starwood Hotels Inc, which is owned by Marriott International Inc (MAR.O), to manage a historic Havana hotel.

Nor does Trump plan to reinstate limits that Obama lifted on the amount of the island’s coveted rum and cigars that Americans can bring home for personal use.  While the changes are far-reaching, they appear to be less sweeping than many US pro-engagement advocates had feared.

Still, it will be the latest attempt by Trump to overturn parts of Obama’s presidential legacy.

He has already pulled the United States out of a major international climate treaty and is trying to scrap his predecessor’s landmark healthcare programme.

“Effective immediately, I am canceling the last administration’s completely one-sided deal with Cuba,” he declared before an audience packed with Cuban-Americans, cheering and chanting: “Viva Cuba libre!”

“Our policy will seek a much better deal for the Cuban people and for the United States of America. We do not want US dollars to prop up a military monopoly that exploits and abuses the citizens of Cuba,” Trump pledged.

“We will not lift sanctions on the Cuban regime until all political prisoners are free,” he said, introducing the crowd to Cuban dissidents, invited to his speech in a theater in Miami’s Little Havana, spiritual home of the exile community.

“It is best for America to have freedom in its hemisphere whether in Cuba or Venezuela,” he said, to huge cheers and a standing ovati