Republicans poured money into the most expensive midterm contest in American history, yet voters delivered a Democratic sweep that many analysts now cast as a direct rebuke of President Donald Trump's Iran war narrative.

Public tallies put total midterm spending near $12bn, much of it on advertising, with a majority of that money backing Republican candidates. The result was a Democratic victory on a scale not seen in half a century. In the aftermath Trump, long accustomed to turning crisis into political theatre, appeared to lose grip on the story that had framed the campaign.

Coverage of the defeat has linked the repudiation not only to domestic discontent but also to the US Israeli war on Iran. That reading sits beside Trump's own remarks blaming the conflict and higher fuel prices for Republican losses, and beside comments from Vice President JD Vance listing the Israel relationship among reasons voters walked away.

The political meaning is still contested inside the Republican Party, where strategists debate whether to defend the war as unfinished business or to distance the 2028 field from it. What the public record already shows is narrower and harder to spin: a historic spending spree failed to sell the administration's account of the conflict, and Congress now returns with Democrats holding new leverage over war funding, oversight and any settlement track.