Trump says the U.S. will reinstate its blockade on Iran and charge a toll on ships

This frame grab taken from AFPTV video footage on Sunday shows cargo ships anchoring near the Strait of Hormuz off the eastern coast of the United Arab Emirates at Khor Fakkan. AFPTV/AFP via Getty Images hide caption

ISTANBUL — President Trump says that the U.S. will not allow Iranian ships to move through the Strait of Hormuz.

"We are reinstating THE IRANIAN BLOCKADE, so named because it is only stopping Iran's ships or customers from entering or leaving," he said in a post online.

Trump said other countries will be able to move through the waterway, but that the U.S. would charge a 20% toll on cargo. He said the toll was reimbursement for doing "the job of providing safety and security to this very volatile section of the World."

The U.S. previously has opposed any tolls or fees on ships moving through the strait.

Iranian leaders have been defiant that Iran controls the Strait of Hormuz.

Trump's latest move comes after the U.S. and Iran exchanged fire for the third weekend in a row, raising the specter of a return to all-out war after a shaky ceasefire took effect in June.

This is a developing story, which will be updated.