Officials stressed that no decisions had been made on either the duration or the financing of a longer-term highway measure that Senate Republicans are likely to advance in the coming days. Without an infusion of cash, the balance in the federal Highway Trust Fund is forecast to drop below $4 billion — the minimum cushion needed to keep money to flowing to states without interruption — by the end of this month. The White House released a statement supporting that measure, saying "the unfortunate reality is that, due to inaction," Congress needs more time to work on a more permanent approach. Since 2009, Congress has passed 34 short-term bills to fund transportation programs. The biggest holdup has been how to pay for a long-term bill because most lawmakers do not want to raise federal gasoline taxes, the chief source of revenue for the programs. Federal fuel taxes and other fees bring in about $35 billion a year, while the government spends about $50 billion on these transportation programs.