HMS Dragon is being loaded with ammunition in Portsmouth having just recently come out of maintenance.
It comes after Trump criticised the PM for refusing to allow the use of UK bases in the initial US-Israel strikes.
Some British nationals are being invited to board the flight from the capital of Oman later on Wednesday.
The Met Police suspect three men of assisting Chinese intelligence services in the UK.
Investigation into claims of sex abuse by the late Harrods owner should include trafficking, says former head of Met's Anti-Trafficking Unit.