A legal challenge has been filed against the Trump administration's so-called Anti-Weaponization Fund, a Treasury Department program valued at approximately $1.776 billion.

The fund was created following a settlement related to President Donald Trump's lawsuit against the Internal Revenue Service over the unauthorized disclosure of his tax returns.

According to critics, the fund is intended to compensate individuals who claim they were unfairly targeted by previous federal investigations and prosecutions, including some Trump supporters and participants connected to the January 6, 2021 Capitol attack.

Former Republican Senator Bill Cassidy of Louisiana, who lost his party primary to a Trump-backed challenger, joined Democratic Senator Cory Booker of New Jersey in submitting an amicus brief opposing the program in the U.S.District Court for the Eastern District of Virginia.The filing argues that the fund exceeds executive authority and infringes upon Congress's constitutional power over federal spending.

The brief describes the program as an immediate threat to the constitutional balance of powers and specifically objects to the possibility of compensation being directed toward individuals involved in the January 6 events.The political debate over the fund also reached the Senate.

Senate Minority Leader Chuck Schumer introduced an amendment intended to prevent the Department of Justice from establishing or administering the fund.The amendment was defeated by a narrow 49-50 vote.

However, three Republican senators facing reelection campaigns—Susan Collins of Maine, Jon Husted of Ohio, and Dan Sullivan of Alaska—joined Democrats in supporting the measure.The controversy highlights ongoing divisions within the Republican Party regarding Trump-related policies and the use of federal funds.