Less than a week after a court filing revealed that President Donald Trump is suing his own Treasury Department and Internal Revenue Service for $10 billion over the leak of his tax returns during his first term, former federal officials and watchdog groups on Thursday called out his attempt to abuse “powerful tools for holding government accountable.”

The legal group Democracy Forward filed a friend-of-the-court brief on behalf of Common Cause, the Project On Government Oversight, ex-IRS Commissioner John Koskinen, former National Taxpayer Advocate Nina Olson, and Kathryn Keneally and Gilbert Rothenberg, who both held leadership roles in the US Department of Justice’s Tax Division.

“This case is extraordinary because the president controls both sides of the litigation, which raises the prospect of collusive litigation tactics,” states the amicus brief. “Collusive litigation threatens the integrity of the judicial process by risking the court’s entanglement in an illegitimate proceeding. And although the complaint has significant defects—it was filed too late, against the wrong party, and for an unsupported and excessive sum of damages—the conflicts of interest make it uncertain whether the Department of Justice will zealously defend the public fisc in the same way that it has against other plaintiffs claiming damages for related events.”

“To maintain the integrity of the judicial process in the face of these highly irregular circumstances, the court should consider exercising its inherent judicial authority to proactively manage this case from the outset,” argued the former officials and groups, known as amici. Specifically, they said:

• First, the court should consider issuing an order for the parties: to show cause why this court has jurisdiction over this case, to explain how they will address the fundamental conflict-of-interest problems with this case, to show why this case should not be stayed until after President Trump leaves office, and to show why the unjustified $10 billion damage figure should not be stricken from the pleadings;
• Second, the court should consider appointing amici who have expertise on issues of tax law and separation-of-powers issues to present fulsome legal arguments on all future issues that arise in this case; and
• Third, the court should consider allowing participation of those amici in hearings.

“To treat this case like business as usual,” the coalition declared, “would threaten the integrity of the justice system and the important taxpayer and privacy protections at the heart of this case.”

In a statement about the new filing in the Southern District of Florida, Abigail Bellows, Common Cause’s senior policy director for anti-corruption and accountability, stressed that “we are watching a president attempt to bully the IRS into giving him billions of our taxpayer dollars.”

“Our government should be accountable to the people, not the whims of a power-hungry executive,” Bellows said. “We urge the court to take steps to promote judicial integrity and protect the public interest.”

President Trump has made $4 billion since his second inauguration. And now, he’s suing the Treasury Department and IRS for $10 billion more in "damages."So we’re filing a brief urging the court to reject President Trump’s scheme and protect taxpayers.

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— Democracy Forward (@democracyforward.org) February 5, 2026 at 5:37 PM

In addition to representing the amici in this case, Democracy Forward has launched various other lawsuits against Trump and his administration, which have faced sweeping allegations of corruption since the president returned to power a year ago.

According to an analysis published by the New York Times editorial board last month, on the one-year anniversary of his second inauguration, Trump and his family enriched themselves to the tune of at least $1.4 billion during the first year of his second term—largely through investment in cryptocurrencies, though he’s also secured settlements from tech and media companies.

Various other members of the second Trump administration have also been accused of corruption and conflicts of interest, and as the Times separately revealed in December, many rich and powerful contributors Trump’s post-election fundraising haul have received corporate-friendly regulatory changes, dropped enforcement cases, government contracts, and even pardons.

“The president’s corruption continues, this time in an attempt to take $10 billion dollars of the taxpayers’ money, which threatens to make a mockery out of our justice system,” said Democracy Forward president and CEO Skye Perryman. “Not only does the president’s baseless case have significant legal defects, but there are colossal conflicts of interest at play.”

“We thank these experts for raising these serious concerns about how President Trump is seeking to further illegally line his own pockets at the public’s expense and our brief urges the court to exercise its power to ensure the matter is not one-sided.”

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