WASHINGTON -- The Senate is poised to add $2 billion to the popular "cash-for-clunkers" program after lawmakers agreed to vote on the government car incentives and give shoppers until Labor Day to visit their local dealerships and make a deal, according to The Associated Press.

Administration officials have estimated the tripling of the $1 billion program could fund an additional 500,000 new car sales, giving automakers a late summer boost after months of ragged sales. The Obama administration has said the program would go broke by Friday without congressional approval of the extension.