The bedrock of the U.S. mortgage market — the 30-year fixed-rate mortgage — may no longer have the same level of bipartisan support in Congress that it once did.

Congressional Democrats remain strongly committed to the 30-year fixed-rate loan, which protects homeowners against a rise in interest rates. But some Republicans, who want to scale back the government's role in the housing market, have growing doubts about the taxpayer-subsidized loan product.

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