Defense hawks are brushing aside concerns that the freshly passed tax cuts could squeeze defense spending and thwart the Trump administration’s efforts to bulk up the military.

Congress’s official scorekeeper has estimated the tax cuts passed by Congress this week could add about $1.5 trillion to the deficit over the next decade. Budget analysts have said the added debt could create new constraints on government spending, including for defense.

But supporters of increased military spending, like other Republicans who supported the tax bill, insist that the deficit predictions are off base.

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“The whole idea is that, as we’ve learned every time we’ve gone through one of these, you do have more funding that comes in because the economy booms,” said Sen. James Inhofe James (Jim) Mountain InhofeChamber of Commerce endorses McSally for reelection Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Top admiral: 'No condition' where US should conduct nuclear test 'at this time' MORE (R-Okla.), a senior member of the Senate Armed Services Committee, this week.

Republicans achieved their biggest legislative victory of the year on Wednesday when they passed a bill that permanently lowers the corporate tax rate from 35 percent to 21 percent and temporarily lowers tax rates for individuals and families.

Meanwhile, defense hawks are pushing a $700 billion defense budget for fiscal 2018 to start a buildup of the military. Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE has asked for 3 percent to 5 percent budget growth each year to pay for a sustained increase of the armed forces that includes thousands of additional troops, dozens of additional ships and a hundred more combat aircraft.

Democrats have slammed Republicans for cutting taxes at the very time they are looking for significant increases in defense spending.

“In an act of absolute pure insanity, we want to reduce revenue by another $1.5 trillion plus. If you add in the interest the debt accrues, I guess it’s over $2 trillion,” Rep. Adam Smith David (Adam) Adam SmithWhen 'Buy American' and common sense collide Overnight Defense: Marine Corps brushes off criticism of Marines' appearance in GOP convention video | US troops injured in collision with Russian vehicle in Syria | Dems ask for probe of Vindman retaliation allegations Democrats press Pentagon watchdog to probe allegations of retaliation against Vindman brothers MORE (D-Wash.), ranking member of the House Armed Services Committee, told reporters at a recent breakfast roundtable.

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“You got all this clamoring that we don’t have enough money for defense because we’re not funding readiness, we’re not ready for North Korea, we’re not ready for Russia, we’re not ready for this, that and the other thing, and then you want to reduce the amount of money [coming in]? It just doesn’t make any sense.”

Bolstering Democrats was a letter from three former Defense secretaries arguing the tax bill could present a national security threat by exacerbating the budget uncertainty that’s plagued the Pentagon in recent years.

“Our intent is not to criticize tax relief itself, but to raise the concern that tax relief without fiscal discipline will inevitably add to the national debt,” Obama administration Defense secretaries Leon Panetta, Ash Carter and Chuck Hagel Charles (Chuck) Timothy HagelWhile our foes deploy hypersonic weapons, Washington debates about funding Hillicon Valley: Democrats request counterintelligence briefing | New pressure for election funding | Republicans urge retaliation against Chinese hackers National security leaders, advocacy groups urge Congress to send election funds to states MORE wrote in a letter to congressional leaders last month. “That increase in the debt will, in the absence of a comprehensive budget that addresses both entitlements and revenues, force even deeper reductions in our national security capabilities.”

Some conservative defense experts likewise raised concerns about the tax bill.

“I don’t see how defense hawks can in good conscience vote for a tax bill that will add at least $1 trillion to our debt. That will undermine our fiscal health and crowd out defense spending. This is a bill that will make China great again,” Max Boot, a senior fellow at the Council on Foreign Relations, tweeted Monday.

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Congress’s most prominent defense hawks, though, supported the tax bill.

House Armed Services Committee Chairman Mac Thornberry William (Mac) McClellan ThornberryTrump payroll-tax deferral for federal workers sparks backlash Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq Top Armed Services Republican 'dismayed' at Trump comments on military leaders MORE (R-Texas) on Thursday blamed tax reform for “sucking all of the oxygen out of the room” and preventing a budget deal that would raise defense spending by Friday’s deadline to fund the government. But he said he doesn’t think the deficit projections will affect the future debate on funding the military.

“I’m sure people will look for all sorts of arguments [against raising budget caps], but it’s true the deficit projections depend enormously on your growth factors that you put into the formula,” he told a small group of reporters.

“I think about this differently. I think that our first obligation is to defend the country. Our obligation is to the men and women who serve, and if we’re not going to adequately support them, then we shouldn’t have them out there doing what we ask them to do.”

Thornberry’s Senate counterpart, Senate Armed Services Committee Chairman John McCain John Sidney McCainThe Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Cindy McCain: Trump allegedly calling war dead 'losers' was 'pretty much' last straw before Biden endorsement MORE (R-Ariz.), was home recovering from the side effects of cancer treatment this week and did not vote on the final tax bill. But he’s previously said he doesn’t see how it relates to defense spending.

“We have a military where we’re losing men and women’s lives because we haven’t funded their training and equipment,” McCain told reporters earlier this year. “That has nothing to do with tax cuts. It has everything to do with the lives with the men and women in uniform — that we are responsible for their needless deaths.”

Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.), an Armed Services Committee member and close ally of McCain’s, said after the tax bill’s passage that the real thing squeezing the defense budget is mandatory spending on domestic programs.

“Spending is about entitlements. What’s going to destroy the Defense Department is entitlements,” he said.

“The No. 1 obligation is to defend the country, and when it comes to the discretionary budget, the Defense Department goes first, but there won’t be money left through entitlements.”