A former attorney general of New Hampshire is disputing President Trump's claim that voter fraud in the state cost former Sen. Kelly Ayotte Kelly Ann AyotteBottom line Bottom line Bottom Line MORE (R) her seat in the 2016 election.

Trump has insisted since the November elections, without presenting any evidence, that he only lost the popular vote because millions of votes were illegally cast. But Trump expanded that unproven charge last week during a closed-door meeting with a group of senators, arguing that both he and Ayotte should have won the vote in New Hampshire, according to Politico.

"Let me as be unequivocal as possible-allegations of voter fraud in NH are baseless, without any merit-it's shameful to spread these fantasies," tweeted Tom Rath, a prominent New Hampshire Republican who worked on the presidential campaigns of former President George W. Bush and 2012 presidential nominee Mitt Romney.

Let me as be unequivocal as possible-allegations of voter fraud in NH are baseless,without any merit-it's shameful to spread these fantasies — Tom Rath (@polguru) February 12, 2017

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Trump said Ayotte's reelection bid was foiled by "thousands" of people who were "brought on buses" from Massachusetts and illegally cast ballots in New Hampshire.

Ayotte was defeated by Democrat Sen. Maggie Hassan by a slim margin in New Hampshire. Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Virginia Democrat blasts Trump's 'appalling' remark about COVID-19 deaths in 'blue states' The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE won the state's four electoral votes.

Last month, the president said he would ask for a "major investigation" into voter fraud, including cases of people legally registered to vote in multiple states and deceased people who have not been taken off state voting rolls. Notably, one of the president's children and several of his advisers are themselves registered in multiple states.