Weeks after the 2020 election, at least one Trump White House aide was named as secretly producing a report that alleged Donald Trump lost to Joe Biden because of Dominion Voting Systems – research that formed the basis of the former president’s wider efforts to overturn the election.

The Dominion report, subtitled “OVERVIEW 12/2/20 – History, Executives, Vote Manipulation Ability and Design, Foreign Ties”, was initially prepared so that it could be sent to legislatures in states where the Trump White House was trying to have Biden’s win reversed.

But top Trump officials would also use the research that stemmed from the White House aide-produced report to weigh other options to return Trump to the presidency, including having the former president sign off on executive orders to authorize sweeping emergency powers.

The previously unreported involvement of the Trump White House aide in the preparation of the Dominion report raises the extraordinary situation of at least one administration official being among the original sources of Trump’s efforts to overturn the 2020 election.

The publicly available version of the Dominion report, which first surfaced in early December 2020 on the conservative outlet the Gateway Pundit, names on the cover and in metadata as its author Katherine Friess, a volunteer on the Trump post-election legal team.

But the Dominion report was in fact produced by the senior Trump White House policy aide Joanna Miller, according to the original version of the document reviewed by the Guardian and a source familiar with the matter, who spoke on the condition of anonymity.

The original version of the Dominion report named Miller – who worked for the senior Trump adviser Peter Navarro – as the author on the cover page, until her name was abruptly replaced with that of Friess before the document was to be released publicly, the source said.

The involvement of a number of other Trump White House aides who worked in Navarro’s office was also scrubbed around that time, the source said. Friess has told the Daily Beast that she had nothing to do with the report and did not know how her name came to be on the document.

It was not clear why Miller’s name was removed from the report, which was sent to Trump’s former attorney Rudy Giuliani on 29 November 2020, or why the White House aide’s involvement was obfuscated in the final 2 December version.

Miller did not immediately respond to a request for comment.

The Dominion report made a number of unsubstantiated allegations that claimed Dominion Voting Systems corruptly ensured there could be “technology glitches which resulted in thousands of votes being added to Joe Biden’s total ballot count”.

Citing unnamed Venezuelan officials, the report also pushed the conspiracy theory that Dominion Voting Systems used software from the election company Smartmatic and had ties to “state-run Venezuelan software and telecommunications companies”.

After the Dominion report became public, Navarro incorporated the claims into his own three-part report, produced with assistance from his aides at the White House, including Miller and another policy aide, Garrett Ziegler, the source said.

Ziegler has also said on a rightwing podcast that he and others in Navarro’s office – seemingly referring to Trump White House aides Christopher Abbott and Hannah Robertson – started working on Navarro’s report about two weeks before the 2020 election took place.

“Two weeks before the election, we were doing those reports hoping that we would pepper the swing states with those,” Ziegler said of the three-part Navarro report in an appearance last July on The Professor’s Record with David K Clements.

The research in the Dominion report also formed the backbone of foreign election interference claims by the former Trump lawyer and conspiracy theorist Sidney Powell, who argued Trump could, as a result, assume emergency presidential powers and suspend normal law.

That included Trump’s executive order 13848, which authorized sweeping powers in the event of foreign election interference, as well as a draft executive order that would have authorized the seizure of voting machines, the Guardian has previously reported.

The claims about Venezuela in the Dominion report appear to have spurred Powell to ask Trump at a 18 December 2020 meeting at the White House – coincidentally facilitated by Ziegler – that she be appointed special counsel to investigate election fraud.

Miller’s authorship of the Dominion report was not the last time the Trump White House, or individuals in the administration, prepared materials to advance the former president’s claims about a stolen election and efforts to return himself to office.

The House select committee investigating the January 6 Capitol attack revealed last year it had found evidence the White House Communications Agency produced a letter for the Trump justice department official Jeffrey Clark to use to pressure states to decertify Biden’s election win.