Lien rights are generally governed by the Illinois Mechanics Lien Act - which provides certain protections to you as the owner. This is particularly true when you have paid the contractor for the work, but the contractor has neglected to pay his sub-contractors. So you may have a defense against the lien claim. Lien claims are often improperly filed by sub-contractors. So, I suggest that you consult with a real estate/construction attorney ASAP (as well as consulting a bankruptcy attorney about claims against the contractor).
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This answer is for informational purposes only and is not intended to be legal advice nor does it establish an attorney-client relationship. Please consult a local business lawyer to obtain legal advice that is tailored to your circumstances and facts. Good luck to you.
Make your claim against his bankruptcy filing. This is fairly convoluted so unless you know the ins and outs of the US District Bankruptcy Court, you might consider hiring a bankruptcy attorney to guide you.