Treasury Secretary Janet Yellen warned Congress that the country could hit the debt ceiling as soon as Jan. 14 in a letter sent Friday.

Treasury Secretary Janet Yellen said her agency will need to start taking “extraordinary measures,” or special accounting maneuvers intended to prevent the nation from hitting the debt ceiling, as early as January 14,

The notification to Congress is the clearest sign yet that the fight to avoid default will likely take place in the early months of the new Trump administration.