WASHINGTON — A coalition of 27 transportation, labor, and other groups are urging lawmakers drafting climate and energy legislation that could impose a carbon tax on gasoline to ensure any resulting tax revenue would be funneled into the highway trust fund instead of other programs.

The groups sent a letter April 1 to Sens. John Kerry, D-Mass., Joseph Lieberman, I-Conn., and Lindsey Graham, R-S.C., asking them to draft legislation that "retains the long-standing principle of dedicating revenues derived from transportation motor fuels to improving the nation's highway and public transportation systems."

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