WASHINGTON — House Republicans introduced a two-month extension of the federal highway and mass transit program Friday, barely two weeks before the government’s authority to help finance projects around the country expires.

Republicans from both chambers said they expected Congress to approve the legislation next week.

Lawmakers are scheduled to leave the capital by next Friday for a weeklong Memorial Day recess. Without an extension, officials worry that federal cash infusions to projects around the country would slow or halt just as the summer construction season begins.

White House spokesman Eric Schultz charged that it would be a “dereliction of responsibility” for lawmakers to return to their districts without approving the legislation. “They should not leave town before doing that,” he said Friday.

Legislators have long wanted to craft a long-term extension of the program but have repeatedly gridlocked over how to pay for it. As a result, Congress has approved a series of short-term extensions.

The bulk of federal road building money comes from the federal gasoline tax, which has been 18.4 cents per gallon since 1993. There is also a 24.4 cents-per-gallon diesel fuel tax, also unchanged in two decades.

Fearing retribution from voters, lawmakers have been leery of raising that tax, even as vehicles become more fuel-efficient and inflation rises. The trust fund has veered near insolvency several times since 2008, with Congress keeping it afloat with general Treasury funds.

Two top House lawmakers – Transportation and Infrastructure Committee Chairman Bill Shuster, R-Pa., and Ways and Means Committee Chairman Paul Ryan, R-Wis. – said in a written statement that they want to extend the highway program through 2015. Financing it through July will provide legislators more time to find a way to do that, they said.

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