Democratic Sen. Carl Levin made the comments yesterday in a statement issued as he returned from a trip to Afghanistan. Levin met with Afghan President Hamid Karzai.
Levin says he told Karzai that the US would not be able to provide aid unless an agreement is reached in the near future.
Earlier this month, the US and Karzai reached an agreement in principle on the major elements of a deal that would allow American troops to stay in Afghanistan after 2014.