The federal judge presiding over Donald Trump’s election subversion case in Washington DC rejected on Saturday a defense effort to dismiss the indictment on claims that the former president was prosecuted for vindictive and political purposes.

Judge Tanya Chutkan’s ruling is the first substantive order since the case was returned to her Friday following a landmark US supreme court opinion in July that conferred broad immunity for former presidents and narrowed special counsel Jack Smith’s case against Trump.

In their motion to dismiss the indictment, defense lawyers argued that Trump was mistreated because he was prosecuted even though others who have challenged election results have avoided criminal charges. Trump, the Republican nominee in the 2024 presidential race, also suggested that President Joe Biden and the US justice department launched a prosecution to prevent him from winning re-election.

But Chutkan rejected both arguments, saying Trump was not charged simply for challenging election results – but instead for “knowingly making false statements in furtherance of criminal conspiracies and for obstruction of election certification proceedings”. She also said that his lawyers had misread news media articles that they had cited in arguing that the prosecution was political in nature.

“After reviewing [the] defendant’s evidence and arguments, the court cannot conclude that he has carried his burden to establish either actual vindictiveness or the presumption of it, and so finds no basis for dismissing this case on those grounds,” Chutkan wrote in her order.

Also Saturday, she scheduled a 16 August status conference to discuss next steps in the case.

The four-count indictment, brought in August 2023, accuses Trump of conspiring to overturn the results of the 2020 election he lost to Biden through a variety of schemes, including by badgering his vice-president, Mike Pence, to block the formal certification of electoral votes.

Trump’s lawyers argued that he was immune from prosecution as a former president, and the case has been on hold since December as his appeal worked its way through the courts.

The supreme court, in a 6-3 opinion, held that presidents enjoy absolute immunity for core constitutional duties and are presumptively immune from prosecution for all other official acts. The justices sent the case back to Chutkan to determine which acts alleged in the indictment can remain part of the prosecution and which must be discarded.