US President Donald Trump will arrive in Saudi Arabia on Tuesday on the first leg of a Gulf tour that will also take him to Qatar and the United Arab Emirates.

The trip marks the Trump’s first major visit abroad of his second term, with the White House saying he looked forward to a "historic return" to the region.

Eight years ago Trump also chose Saudi Arabia for his first overseas trip as president.

In the days before the trip, the White House has played an instrumental part in hammering out a ceasefire between India and Pakistan, the release of an American hostage in Gaza and holding another round of nuclear talks with Iran.

Those initiatives came after a surprise announcement by Trump last week of agreeing to a truce with the Iran-backed Houthis in Yemen.

'Deals'

But the focus of the Gulf will likely be locking down business agreements.

"White House sources have indicated that the president will focus on 'deals'," wrote Daniel B. Shapiro, a distinguished fellow with the Atlantic Council's Scowcroft Middle East Security Initiative.

Riyadh, Doha and Abu Dhabi are expected to roll out the red carpet with a lavish royal welcome for the 78-year-old billionaire.

"The president looks forward to embarking on his historic return to the Middle East" to promote a vision where "extremism is defeated in place of commerce and cultural exchanges", Trump's spokeswoman Karoline Leavitt said ahead of the trip.

The Gulf states have positioned themselves as key diplomatic partners during Trump's second term.

Doha remains a major broker for negotiations between Hamas and Israel, while Saudi Arabia has facilitated talks on the war in Ukraine.

Talk of returning to the kingdom has been circulating for months, with Saudi Arabia's de facto ruler Crown Prince Mohammed bin Salman vowing to pour $600 billion into US trade and investments.

"I'll be asking the crown prince, who's a fantastic guy, to round it out to around one trillion. I think they'll do that because we've been very good to them," Trump said in response to the offer.

According to a Saudi official close to the defence ministry, Riyadh will push for securing the latest US F-35 fighter jets along with state-of-the-art air defence systems worth billions of dollars.

"We will condition that the deliveries take place during Trump's term," the source told AFP.

Efforts to push Saudi Arabia to recognise Israel are not likely to feature high on the agenda this trip, with Riyadh insisting a Palestinian state must be established before a deal can be brokered.

Iran, meanwhile, is likely to feature prominently during the visit, following a fourth round of talks in Oman over the weekend.

Controversy is also swirling over the president's plans to accept a luxury Boeing jet from the Qatari royal family for use as Air Force One.

Late Sunday, Trump went on the offensive amid a wave of criticism, saying the plane was a temporary "gift".

He later called the deal "a very public and transparent transaction", and on Monday said before leaving Washington for his trip:

"I would never be one to turn down that kind of an offer."