Lawsuits challenging the Texas Republican's eligibility for the ballot have been filed in recent weeks by residents in states including Illinois, New York and Alabama who argue he can't be president because he's not a natural-born citizen.
Cruz and some legal experts say he's eligible because his mother was a U.S. citizen when he was born.
Lawrence Joyce, a pharmacist and lawyer from Poplar Grove, Illinois, said Friday he filed suit in Chicago because he wants to avoid what he called a potential "nightmare scenario."
