The Senate has been signaling changes to the "One Big Beautiful Bill Act" are coming, and as Congress barrels toward its deadline, those changes are taking shape.

Two nonpartisan groups are launching a $5 million advertising campaign urging vulnerable Republican senators to oppose the GOP's mega budget reconciliation bill, Axios has learned. Why it matters: It's one of the first major media campaigns against the tax and spending cut package, landing as Senate Republicans negotiate changes to the bill.