Trump wants other countries to help reopen the Strait of Hormuz. That might not be so easy.

U.S. allies and rivals responded cautiously after President Donald Trump said they should police the Strait of Hormuz, as Iranian threats to strike shipping on the vital trade route continue to cause chaos in global markets.“Many countries, especially those who are affected by Iran’s attempted closure of the Hormuz Strait, will be sending War Ships” to secure the shipping route, he posted Saturday on Truth Social, listing China, France, Japan, South Korea, the U.K. and “others” among the nations he hoped would provide support.“The U.S. will also coordinate with those Countries so that everything goes quickly, smoothly, and well.

U.S. allies and rivals responded cautiously after President Donald Trump said they should police the Strait of Hormuz, as Iranian threats to strike shipping on the vital trade route continue to cause chaos in global markets.

“Many countries, especially those who are affected by Iran’s attempted closure of the Hormuz Strait, will be sending War Ships” to secure the shipping route, he posted Saturday on Truth Social, listing China, France, Japan, South Korea, the U.K. and “others” among the nations he hoped would provide support.

“The U.S. will also coordinate with those Countries so that everything goes quickly, smoothly, and well. This should have always been a team effort, and now it will be,” he added in a subsequent post.

The Strait of Hormuz, which links the Persian Gulf to the open ocean, is a key trade artery through which around a fifth of the world’s oil passes, carried by about 3,000 ships sailing through the corridor each month. But numerous ships have come under attack in the area since the war began two weeks ago, all but bringing a halt to the trade and leading to a dramatic rise in oil prices.

In a phone interview with NBC News on Saturday, Trump said several countries would help secure the strait. “They’ve not only committed, but they think it’s a great idea,” he said. Energy Secretary Chris Wright told NBC News’ “Meet the Press” on Sunday that he expects China to be a “constructive partner” in reopening the strait.