Conservative groups plan to seek an emergency injunction after a federal judge upheld Illinois laws limiting the amount of money that individuals, corporations, unions and PACs can donate to candidates.
The judge says removing the limits could open the door to more political corruption in the state.
But the Illinois Policy Institute, Liberty PAC, and others say the limits are an infringement on free speech.
They want an injunction that would prevent the state from enforcing the limits in the weeks leading up to Election Day.