Since the US and Israel attacked Iran in February, Tehran has largely blocked the Strait of Hormuz - through which about a fifth of the world's oil and liquefied natural gas usually passes. Reopening it has been a key point of discussion.
Oman borders the southern side of the Strait and says it is a neutral country in this conflict. However it has suffered a number of strikes from Iran and is now playing a key role in negotiating with Tehran to reopen the waterway.
Washington has pursued its own efforts to secure the reopening. Fox reporter Trey Yingst quoted Trump as saying: "If Oman gets in the way, we'll bomb the shit out of them."
