President Donald Trump's administration is facing calls for an ethics probe amid plans to accept a $400-million "palace in the sky" jet from Qatar.

A deal on a plane that would become Air Force One has not been reached, but ethics experts say accepting it from Qatar would violate the Constitution’s emoluments clause.

President Donald Trump embarks Monday on the first major international trip of his second term – an opportunity to shore up relations with a trio of key Middle Eastern allies and prove his might as a dealmaker on the world stage.

President Trump has always viewed the presidency as a worldwide hunt for deals. And there is no better place for that than the Gulf, where a few men wield absolute authority over vast wealth.