Democrats and Republicans are locked in a budget fight that could keep the military from receiving expected pay raises next year.

Without an agreement on spending issues before the new fiscal year starts on Oct. 1, Congress would likely need to pass a short-term spending measure to avert a shutdown. But that would hold military pay raises at 2015 levels, denying servicemembers higher salaries that lawmakers back.

The fight intensified on Thursday when Senate Democrats blocked consideration of a 2016 defense spending bill.

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Democrats and the White House oppose the measure because it provides extra money to a Pentagon war fund, allowing the Defense Department to circumvent budget caps that remain in place for non-defense spending. They have vowed to block all 12 annual government spending bills in the upper chamber unless Republicans sit down for talks on lifting spending caps across the board.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellOcasio-Cortez to voters: Tell McConnell 'he is playing with fire' with Ginsburg's seat McConnell locks down key GOP votes in Supreme Court fight Video shows NYC subway station renamed after Ruth Bader Ginsburg MORE (R-Ky.) has rejected those calls and suggested he would bring the defense bill back up.

But with all but one Democrat voting to block consideration, it's unclear whether the outcome will be any different, and both sides are digging in.

House Speaker John Boehner John Andrew BoehnerLongtime House parliamentarian to step down Five things we learned from this year's primaries Bad blood between Pelosi, Meadows complicates coronavirus talks MORE (R-Ohio) characterized Democrats as wanting to block military pay raises in a video message shortly before Thursday's Senate vote.

"We live in a dangerous world, and whatever our troops need, they should get. And they ought to get a raise too," said Boehner John Andrew BoehnerLongtime House parliamentarian to step down Five things we learned from this year's primaries Bad blood between Pelosi, Meadows complicates coronavirus talks MORE. "Our troops come first. Save the politics for another day.”

But Democrats hit back, citing the Pentagon war fund.

“Funding the base operations of the Department of Defense through an accounting gimmick is no way to support the service members and their families who sacrifice so much for our nation’s defense,” said Sen. Bob Casey Robert (Bob) Patrick CaseySecond GOP senator to quarantine after exposure to coronavirus GAO report finds brokers offered false info on coverage for pre-existing conditions Catholic group launches .7M campaign against Biden targeting swing-state voters MORE (D-Pa.) in a statement after the vote.

The defense bill is the first of 12 spending bills that have to be passed by October 1st, with fewer than 45 scheduled workdays in the Senate before the new fiscal year.

If there's no movement by Oct. 1, Congress must pass a continuing resolution to avoid a shutdown. And if the continuing resolution is still in effect on January 1, when military pay raises are slated to kick in, troops won't get the higher salaries.

The House defense spending bill raises military pay by 2.3 percent, while the Senate authorizes a 1.3 percent raise. The White House has also requested 1.3 percent.

However, under a continuing resolution, the military would only receive the current 1.0 percent pay raise for most troops.

Lawmakers, though, could pass a spending bill that makes those pay raises retroactive.

Military pay was also an issue during the last government shutdown in 2013, with Congress passing the "Pay Our Military Act" to ensure troops received their salaries.

Defense budget experts are not optimistic lawmakers will reach a deal lifting caps as Democrats seek in time.

“For now, there is little prospect of passing an appropriations bill that repairs the extensive damage done to the U.S. military by the Budget Control Act and sequestration,” said Foreign Policy Initiative’s policy director David Adesnik in a piece Friday.

For now, both sides are standing firm and the war of words is intensifying.

“Our troops face enough challenges without Congress manufacturing new ones,” added Sen. Jack Reed John (Jack) Francis ReedWhen 'Buy American' and common sense collide Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (D-R.I.), ranking member on the Senate Armed Services Committee.

“The Republican leadership is steering… the appropriations process toward another fiscal cliff that leads to another omnibus or continuing resolution."

House Armed Services Committee Chairman Mac Thornberry (R-Texas) countered that he hoped "Senate Democrats do the right thing and carefully consider the Defense funding bill," in a statement Friday.

"Holding defense hostage to extract more funding for other agencies like the IRS and EPA is the height of irresponsibility. Our troops and the country deserve better," he said.

Sen. Joe Donnelly Joseph (Joe) Simon DonnellyNames to watch as Trump picks Ginsburg replacement on Supreme Court Momentum growing among Republicans for Supreme Court vote before Election Day Barrett seen as a front-runner for Trump Supreme Court pick MORE (Ind.), the lone Democrat to vote for taking up the defense spending bill on Thursday highlighted the difficult politics.

In a statement after the vote, he said he disagreed with keeping caps on non-defense spending. "I also recognize that supporting our troops and their families goes beyond the Pentagon’s budget," he said.

“It is my hope that in the coming months, members on both sides of the aisle can come together and begin the hard work of negotiating a bipartisan budget that reflects all of our country’s needs," Donnelly said.