Sen. Bill Cassidy signs onto brief calling 'anti-weaponization' fund a 'dire threat'

Senator Bill Cassidy (R-LA) speaks during the CNBC CEO Council Summit in Washington D.C. on June 2, 2026. Aaron Clamage | CNBC Louisiana Republican Sen. Bill Cassidy signed onto an amicus brief calling President Donald Trump 's " weaponization " fund a "dire threat" to Congress and the constitutional order. The amicus brief from Cassidy and Sen. Cory Booker , D-N.J., was filed Wednesday in a case challenging the fund that's working its way through court in Virginia. Cassidy last month lost out of a runoff in Louisiana amid a Trump-backed primary challenge , and Congress is weighing amendments to a budget reconciliation bill that could ax the "lawfare" fund entirely. Cassidy's inclusion on the brief is a window into the broad opposition to the fund from Senate Republicans, who rarely buck Trump due to potential political consequences. It also underscores how Cassidy, who has no more elections to run, could complicate future votes in the Senate. The brief argues that the court, which halted the fund temporarily in May , should uphold its block. The senators argued that the fund represents the "immediate and dire threat to our constitutional order and the authority of Congress." "The existence of the Fund strikes at the core of Congressional authority and our Constitutional order," the senators said.