A Democratic-controlled Congress will likely try to constrain Trump’s foreign adventures

But the president still has veto power, which he can wield to dictate policy over tariffs, the war in Iran or aid for Ukraine

In a rare occurrence, a US election may have actually been decided by foreign policy. Donald Trump’s war in Iran and international tariffs are seen as playing a key role in the inflationary pressures that drove so many Americans to vote against his party on Tuesday in what has been described as a “generational wipeout” for the Republicans.

And in the coming months, the president is going to face severe headwinds on those policies as Democrats storm back into control of Congress, threatening investigations of some of his top envoys and Pentagon contractors, big fights over budgets linked to the Iran war, and greater scrutiny of US relationships with allies such as Israel.