Iran has turned US President Donald Trump's midterm election setback into a public celebration. Thousands gathered in Tehran for anti-US and anti-Israel demonstrations, cheering as images of Trump, US Vice President JD Vance and Israeli Prime Minister Benjamin Netanyahu were burned. Iranian officials have portrayed the Republican Party's losses as a political setback for Washington. Trump has acknowledged that the Iran war played a role in the election outcome, while continuing to defend the US military campaign. With Democrats taking control of both chambers of Congress, Trump's military decisions could face greater scrutiny. But Tehran is warning against expectations of a major shift in American policy.