Illinois Senate President John Cullerton says he’ll send a bill that overhauls how Illinois doles out money to schools to Gov. Bruce Rauner’s desk today.

Rauner says he’ll use his amendatory powers to rewrite the bill and send it back to the Senate over objections to funding for Chicago Public Schools. But he’s repeatedly declined to specify what exactly he’ll do.

To overrule Rauner, a three-fifths majority is needed. If that attempt fails, the bill dies. Lawmakers are also in Springfield today – where a special session is expected to convene at noon.

A new formula is required as part of the budget that legislators approved earlier this month. Without a new calculation, schools won’t get paid. The first payment to schools is due Aug. 10.