Donald Trump Jr. has publicly aligned himself with Vice President JD Vance in criticizing the US president's war in Iran, suggesting it played a role in the Republican party's substantial losses in the recent midterm elections.

The Republican party lost control of both the House and the Senate in the midterms, which sources suggest became a referendum on the White House's performance. Growing public anger over surging petrol prices, the impact of tariffs, and the war in Iran were cited as key factors.

Following the election results, Vance posted a lengthy statement on X (formerly Twitter) detailing reasons for the party's defeat and appealing to Republican voters for future support for the MAGA movement. Vance specifically stated, "The reason we lost is the war. The president himself said so last night."

Donald Trump Jr. responded positively to Vance's post, writing, "every word of this is..." and adding three celebratory emojis. Vance also urged supporters of the Iran war to take responsibility for the outcome, stating, "If you'd like to argue it was worth it, that losing the Senate for the next 6 years was worth it, then do so. Argue it was a worthwhile cost to pay. Agree or disagree, that's at least honest."

Vance reportedly privately advised the president against the war but largely refrained from public criticism until after the election. He characterized the Iran conflict as not a "forever war" like previous lengthy engagements in Iraq and Afghanistan. Secretary of State Marco Rubio also privately urged caution before the war but spoke less about the operation once it did not conclude as quickly as predicted.

Trump himself acknowledged in a late-night interview with Fox News that high gas prices, linked to the Iran war, were a negative consequence that impacted the elections. "I understand that, I don't agree with it... it's a short term problem for long term gain…The gasoline was caused by Iran," he said.

Democrats reportedly saw increased support from moderate voters, particularly in key Senate races where they flipped Republican-held seats. Approximately two-thirds of moderates backed Democratic candidates in their local US House races, an increase from previous elections. A significant majority of moderate voters, around eight in 10, felt Congress was not sufficiently providing checks and balances on the presidency, and a similar share reported experiencing moderate hardship due to inflation over the past year.