A bill that homeowners advocates warn will make it more difficult to challenge improper foreclosure attempts by big mortgage processors is awaiting President Barack Obama’s signature after it quietly zoomed through the Senate last week.

The bill, passed without public debate in a way that even surprised its main sponsor, Republican Representative Robert Aderholt, requires courts to accept as valid document notarizations made out of state, making it harder to challenge the authenticity of foreclosure and other legal documents.

The timing raised eyebrows, coming during a rising furor over improper affidavits and other filings in foreclosure actions by large mortgage processors such as GMAC, JPMorgan and Bank of America…The legislation could protect bank and mortgage processors from liability for false or improperly prepared documents.