WASHINGTON (AP) _ A top Republican congressional aide says the $800 billion-plus economic stimulus measure could steer government checks to illegal immigrants. Republican officials are concerned that the Democratic-written legislation makes people who came to the United States illegally eligible for tax credits of $500 per worker and $1,000 per couple. A House-passed version of the bill and one making its way through the Senate both disqualify nonresident aliens from receiving the credits. But neither requires a worker to have a Social Security number to get the credits. An economic aid measure enacted in February 2008 that sent rebates to most wage earners required that people have valid Social Security numbers in order to get checks.