An aid package scheduled for Ukraine later this month will be the final one unless Congress approves additional help, the White House warned Monday.

While aid provided to Ukraine thus far has been essential in resisting Russia’s invasion of Ukraine, the country “still needs our help,” National Security Council spokesman John Kirby told reporters Monday.

He pointed toward a letter to Congress from the comptroller of the Department of Defense, Mike McCord, warning the department had fully allocated all remaining funding under the department’s replenishment authority earmarked for Ukraine.

“We are still planning one more aid package to Ukraine later this month. However, when that one’s done, as the comptroller Mr. McCord made clear in his note to Congress today, we will have no more replenishment authority available to us, and we’re going to need Congress to act without delay, as we have been saying,” Kirby said.