CHICAGO (AP) — A leading child advocacy organization is backing a proposal to replace Illinois’ flat income tax with a system to tax the state’s highest earners more.

Democratic state Rep. Lou Lang has pitched a graduated income tax plan he says would mean a tax cut for 99 percent of residents and generate $1.9 billion. The plan to change Illinois’ tax code is contingent upon voter approval so a coinciding measure aimed at November’s ballot has been introduced.

Legislators are expected to consider both in committees this week.

Voices for Illinois Children spokeswoman Emily Miller said Monday that the revenue would help restore cuts to vital services.

However, the Illinois Chamber of Commerce is opposed, saying high earners would leave Illinois.

Republican Gov. Bruce Rauner also objects.

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The bills are HB689 and HJRCA59.