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(Fox News) - Even if the House leadership can drum up enough votes to pass the Senate's immigration bill — it might get derailed on procedural grounds.

The Hill newspaper reports House Republicans are poised to exercise what's called a "blue slip" protest. The constitution mandates that revenue-related bills must originate in the House. But the Senate proposal requires illegal immigrants to pay back taxes before becoming citizens — and that makes it a revenue bill.

One House GOP aide tells the paper — "I think it's going to be a matter of who will get there first. A number of people in the House are dying to be fingered as the person who killed the Senate bill."

A House member would introduce the "blue slip" and it would then be debated and voted upon — with a majority vote either killing it or sending the bill back to the Senate.