DALLAS -- The Chicago Teachers Union may challenge a newly signed school aid funding bill because it includes a $75 million tax credit program for donations made to private schools.

The CTU said it is considering suing to block the school funding law because of the tax credit provision, a spokesperson confirmed. The union has labeled the program a voucher program that would harm public schools.

“Our lawyers are evaluating the constitutional issues, civil rights issues and non-severability clause included in the bill,” the spokesperson said.

Illinois Gov. Bruce Rauner
Illinois Gov. Rauner signed the Illinois school funding bill into law Thursday in Chicago.

If the union successfully challenges the tax credits, the entire school funding measure would be “invalid” under a provision lawmakers inserted into the legislation. The measure authorized additional funds for the fiscally challenged Chicago Public Schools.

Illinois Gov. Bruce Rauner signed the bill into law Thursday afternoon in a ceremony, attended by Chicago Mayor Raum Emanuel, held at a Chicago elementary school. Comptroller Susana Mendoza will pay $540 million in state aid owed to schools for August, once the bill becomes law.

The bill allows the state to distribute education aid and will provide $450 million for CPS, about $150 million more than the district had expected in the $5.7 billion budget the school board approved Monday.

The bill landed support from the Republican governor and GOP lawmakers by including the $75 million tax credit program for donations made to private schools.

Rauner has called the compromise bill a victory. The governor’s previously used his amendatory veto powers to reshape the original school funding overhaul legislation in Senate Bill 1 lawmakers approved in May to dramatically cut CPS funding and reshape how tax-increment funding and future enrollment changes impact funding formulas.

The compromise bill he signed directs more money to the Chicago schools.

In a press conference on Wednesday following the Senate and House approval of the bill, Rauner called the deal “a compromise that was reasonable and was worked out on a bipartisan basis.”

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