The deal to raise the debt ceiling through the end of next year and cut spending locks in President Joe Biden's proposed defense budget at its cap.

Biden’s budget request, released in March, includes $842 billion for the Department of Defense and roughly another $44 billion for non-Pentagon defense spending, totaling approximately $886 billion. The deal, which House Speaker Kevin McCarthy (R-CA) and Biden announced over Memorial Day weekend to avoid the U.S. defaulting on the national debt, caps national security spending for fiscal 2024 at that $886 billion mark, a 3.3% increase over this year.

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While the top line is a $26 billion increase from the $816 billion that was enacted in the 2023 budget and is the biggest defense budget in U.S. history, there were some Republicans who argued at the time it was announced that Biden's proposal was insufficient to fully fund the U.S. military. Some lawmakers have already begun raising those concerns again since the deal was announced on Saturday.

"I will use all powers available to me in the Senate to have amendment votes to undo this catastrophe for defense," Sen. Lindsey Graham (R-SC) tweeted. "I support raising the debt limit for 90 days to give us a chance to correct this disaster for defense. Have total disgust for political leaders’ decision to make it remotely possible to gut our national security apparatus at a time of great peril. Take this absurd idea off the table."

Last year, Congress opted to add $40 billion to Biden's fiscal 2023 defense budget due to concerns of inadequacy, and while some Republicans, like Graham, expressed intent to do that again after the president's new budget proposal, now that's in question.

President Joe Biden addressed these concerns on Monday while taking questions from reporters on the South Lawn, saying, "Look, whatever the fighting force needs, if there’s another — first of all, they passed my budget, what I asked for in defense. They passed that. Obviously, if there’s any existential need for additional funding, I have no doubt we’d be able to get it because we’d jointly do it."

The bill also authorizes a 1% increase for both defense and non-defense spending in fiscal 2025, which would put the fiscal 2025 defense spending top line at $895 billion.

The House and Senate are expected to vote on the agreement this week to prevent a default.

Defense officials warned in recent weeks that a default, which would be the first in U.S. history, would harm U.S. troops' readiness.

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"I think there's no doubt whatsoever that there would be a very significant negative impact on the readiness, morale, and capabilities of the United States military if we defaulted and didn't reach a debt ceiling thing," Chairman of the Joint Chiefs of Staff Gen. Mark Milley told reporters during a press briefing last week. "I think it would be very, very significant without a doubt in that [it would have] absolutely clear, unambiguous implications on national security."

Earlier this month, Defense Secretary Lloyd Austin told lawmakers, “There’s just a number of things that we’re working with allies and partners on that would come into question as to whether or not we’ll be able to execute programs," adding, "Most importantly, this will affect the livelihood of our troops and our civilians."