Trump's threat on Oman, which has been holding its own talks with Iran to reopen the Strait of Hormuz, comes as a 60-day window for peace negotiations expires.

The US president has already paid the writer over $5m in damages in the assault and defamation case.

Trump cites his "very good relationship" with North Korea's leader in deciding to downsize the exercises.

The Australian, who notoriously poisoned her family members, is trying to overturn her conviction.