Saudi Arabia, a key Gulf ally, suspended the U.S. military’s ability to use its bases and airspace to carry out the operation, sources say.

Donald Trump’s abrupt reversal on his plan to help ships go through the Strait of Hormuz came after a key Gulf ally suspended the U.S. military’s ability to use its bases and airspace to carry out the operation, according to two U.S. officials.

Trump surprised Gulf allies by announcing “Project Freedom” on social media Sunday afternoon, the officials said, angering leadership in Saudi Arabia. In response, the Kingdom informed the U.S. it would not allow the U.S. military to fly aircraft from Prince Sultan Airbase southeast of Riyadh or fly through Saudi airspace to support the effort, the officials said.