Donald Trump has started his four-day trip to the Middle East by strengthening ties with Saudi Arabia.

The US president has met with the country's de facto ruler, Crown Prince Mohammed bin Salman.

They announced a $600 billion (USD) commitment from Saudi Arabia to invest in America.

The two also discussed efforts to dismantle Iran's nuclear programme and end the war in Gaza.

US correspondent Dan Mitchinson says this trip has raised concerns - especially following the infamous plane gift Trump received from Qatar.

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