In the Truth Social post, Trump made vague claims about polling, voting “dumps”, and “machines” without providing specific evidence of error or wrongdoing.

He has previously attempted to cast doubts on the integrity of elections he has lost, although he himself was not on the ballot in the midterms.

“We would have won easily if I was on the ballot,” Trump told CBS News, the BBC’s US partner, after it was confirmed his party had lost both the Senate and the House.

As it stands, Democrats have won 54 US Senate seats and 254 US House seats in the midterms, giving them comfortable majorities in both chambers of Congress even as counting continues in some races.

The outcome has been clear since election night and Trump told the New York Times then: “We’ll, you know, look forward to working with [Democrats]”, adding: “We’ll probably work something out.”

He has also offered his own analysis of why Republicans lost, acknowledging on Fox News that the Iran war had contributed to the defeat.

“People agree with what I’m doing on Iran but they really probably weren’t willing to do the short term consequences of paying more for gasoline – I understand that,” he said.

Vice-President JD Vance has also blamed the Iran war, which began in February and which has severely disrupted global oil and gas supplies – causing costs to soar, as the reason their party lost the election.

In the run-up to the midterms, Trump made claims about widespread voting fraud, despite evidence that it is rare.

He and his allies alleged for months that the 2020 presidential election, which he lost to former President Joe Biden, had been rigged against him. His lawyers and allies spent weeks attempting to litigate the results, but courts repeatedly struck them down.

The justice department during his administration has made unprecedented attempts to exert more federal control over elections – a power the Constitution primarily delegates to individual states.

Days before these midterms, it filed controversial lawsuits in federal courts challenging the count and certification of votes in states like California and Alaska, but judges ruled against them in nearly all instances.

Election law experts, state officials, and local elections offices told the BBC they had spent months preparing for a scenario in which the White House or election sceptics questioned the votes’ legitimacy.

Despite the intense focus around election integrity on both sides of the debate, top state and local election officials have reported a mostly smooth process so far for the 2026 midterms.

Extreme weather did force some location closures, and a handful of reported administrative or technical issues slowed the process in some local jurisdictions.