WASHINGTON — The top Republican on the Senate Finance Committee last week rebuked a congressionally mandated panel that is expected on Tuesday to propose raising the gas tax as much as eight cents to improve the nation’s aging surface transportation network.

“A special commission came up with an old, cold, bad idea,” Sen. Charles E. Grassley, R-Iowa, said in a release issued Friday. “We have economists saying the increase in energy costs is adding to recession concerns, while this commission reportedly will say we should add to those concerns.

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