Treasury Secretary Janet Yellen on Wednesday warned the United States could hit its debt limit by next month, warning Congress that she will run out of maneuvering room. In a letter to leaders of Congress, Yellen said she can’t provide a specific date for when she’ll be not able to keep the federal government funded unless the chamber raises the debt limit. Should that happen, according to estimates from the Congressional Budget Office, funding for Social Security, Supplemental Security Income, and Medicare will likely be halted. “Given this uncertainty, the Treasury Department is not able to provide a specific estimate of how long the extraordinary measures will last,” the secretary wrote in the letter (pdf). “However, based on our best and most recent information, the most likely outcome is that cash and extraordinary measures will be exhausted during the month of October. We will continue to update Congress as more …