Defense analysts are slamming President Trump’s budget as not meeting his campaign claims for “historic” hikes in spending for the Pentagon.

Trump’s budget request includes $603 billion for defense and national security issues, but if passed would only represent the ninth largest increase for the Pentagon in the past 40 years, according to Todd Harrison, a defense expert at the Center for Strategic and International Studies.

The plan asks for $54 billion in spending above a ceiling set by the 2011 Budget Control Act, but only $19 billion more than was planned for this year by President Obama.

It is far below the $640 billion defense hawks wanted.

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House Armed Services Chairman Mac Thornberry (R-Texas) and Senate Armed Services Chairman John McCain (R-Ariz.) have both said those funds are needed to keep the president's lofty defense promises on the campaign trail and turn back years of declining military readiness.

Trump told state governors at the White House in February that his budget plan included a “historic increase in defense spending to rebuild the depleted military of the United States of America.”

He added that his proposal was a “landmark event” and would send a message of “American strength, security and resolve” to the world.

McCain slammed Trump’s plan in a statement Tuesday, calling it “inadequate to the challenges we face, illegal under current law, and part of an overall budget proposal that is dead on arrival in Congress.”

McCain said that after years of budget cuts, “this budget request fails to provide the necessary resources to restore military readiness, rebuild military capacity, and renew our military advantage with investments in modern capabilities.”

Thornberry told reporters on Friday that $640 billion is the number “that we believe is required to begin to repair the damage that's been done on readiness and to ... keep the president's promises.”

The Heritage Foundation said in a statement that a $603 billion budget “might be enough to stop the immediate deterioration and cuts in forces, but it will certainly not be enough to reverse the ravages already experienced” in recent years.

The budget proposes $6.7 trillion in spending on national defense over the next decade.

It calls for keeping spending caps through 2027, though the BCA caps officially expire in 2021. That request is likely to receive strong pushback in Congress, where earlier this month more than 140 Republican lawmakers sent a letter to House Speaker Paul Ryan (R-Wis.) calling for a vote to repeal the budget caps.

The language goes against Trump’s previous calls for eliminating the caps and campaign promise to repeal them immediately.

Fiscal conservatives, however, have been more supportive of the caps, arguing they help control runaway spending.

The White House released the document as Trump is traveling from Israel to Europe on his first foreign trip.