The White House on Monday sounded the alarm that it will run out of money to provide weapons to Ukraine in its fight against Russia without congressional action by the end of the year.

In a letter to congressional leaders, Office of Management and Budget director Shalanda Young wrote the government is “out of money—and nearly out of time” to continue giving aid to Ukraine. The White House pleaded with Congress to act on a supplemental funding request first submitted in October, arguing it is of critical importance to U.S. national security.

“I want to be clear: without congressional action, by the end of the year we will run out of resources to procure more weapons and equipment for Ukraine and to provide equipment from U.S. military stocks. There is no magical pot of funding available to meet this moment. We are out of money—and nearly out of time,” Young wrote.