Trump continues to falsely assert that the 2020 election was stolen despite abundant evidence to the contrary, much of which had been provided to him or was publicly available before the Capitol assault. The Trump campaign's commissioning of its own report to study the then-president's fraud claims has not been previously reported.

"They looked at everything: change of addresses, illegal immigrants, ballot harvesting, people voting twice, machines being tampered with, ballots that were sent to vacant addresses that were returned and voted," said a person familiar with the work who, like others, spoke on the condition of anonymity to describe private research and meetings. "Literally anything you could think of. Voter turnout anomalies, date of birth anomalies, whether dead people voted. If there was anything under the sun that could be thought of, they looked at it."

The findings were not what the Trump campaign had been hoping for, according to the four people. While the researchers believed there were voting anomalies and unusual data patterns in a few states, along with some instances in which laws may have been skirted, they did not believe the anomalies were significant enough to make a difference in who won the election.

The research also contradicted some of Trump's more conspiratorial theories, such as his baseless allegations about rigged voting machines and large numbers of dead people voting.

A person familiar with the findings said there were at least a dozen hypotheses that Trump's team wanted tested.

"None of these were significant enough," this person said. "Just like any election, there are always errors, omissions and irregularities. It was nowhere close enough to what they wanted to prove, and it actually went in both directions."

Senior officials from Berkeley Research Group briefed Trump, then-chief of staff Mark Meadows and others on the findings in a December 2020 conference call, people familiar with the matter said. Meadows showed skepticism of the findings and continued to maintain that Trump won. Trump also continued to say he won the election. The call grew contentious, people with knowledge of the meeting said.