A federal judge has dismissed a lawsuit by the Trump campaign that sought to discard millions of mail-in votes in Pennsylvania.
The dismissal comes as a major blow to the current US president, who has failed in his efforts so far to overturn the election loss to Democratic President-elect Joe Biden.
The Trump election lawsuits seek to stop officials from declaring Biden's victory in key battleground states, due to alleged voter fraud by mail-in ballots.
On Sunday (NZ time), US District Judge Matthew Brann said the Trump campaign had only presented "strained legal arguments without merit and speculative accusations... unsupported by evidence".
The Trump campaign has filed 36 election lawsuits - at least 24 have come back denied, declined, settled or withdrawn.
Judge Brann, a longtime conservative Republican, said the Trump campaign had failed to demonstrate widespread voter fraud in his 37-page written decision.
"In the United States of America, this cannot justify the disenfranchisement of a single voter, let alone all the voters of its sixth most populated state. Our people, laws, and institutions demand more," Brann said.
According to Reuters, Trump's lawyers are seeking an appeal of the judge's ruling against their effort to throw out mail-in ballots.
The ruling comes four days after Trump's personal attorney Rudy Giuliani claimed, without evidence, that Trump had been the victim of "widespread national voter fraud".
In a statement, Giuliani and Jenna Ellis, senior legal adviser to Trump's campaign, said they hoped to take the case to the Third Circuit of the US Court of Appeals.
On Sunday, Pennsylvania Senator Pat Toomey said Trump had "exhausted all plausible legal options to challenge the result of the presidential race in Pennsylvania".
"President Trump should accept the outcome of the election and facilitate the presidential transition process," he wrote in a statement.