Senate Democrats on Wednesday joined with Republicans to approve an annual defense bill, defying a veto threat from President Obama.

The Senate voted 70-27 in favor of the $612 billion National Defense Authorization Act (NDAA), a wide-ranging measure that would set policy and spending priorities for the Pentagon. Twenty Democrats voted yes, as did Sen. Angus KingAngus KingSenate Democrats push to include free phone calls for incarcerated people in next relief package Trump's pitch to Maine lobstermen falls flat OVERNIGHT ENERGY: Court cancels shutdown of Dakota Access Pipeline | US could avoid 4.5M early deaths by fighting climate change, study finds | Officials warn of increasing cyber threats to critical infrastructure during pandemic MORE (Maine), an Independent who caucuses with Democrats.

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While the vote total would be enough for Republicans to override Obama’s promised veto, Democratic leaders insist that some of their members would vote differently if asked to override the president.

“The president is going to veto this. Everyone knows this,” Senate Minority Leader Harry ReidHarry Mason ReidMcConnell goes hands-off on coronavirus relief bill Kamala Harris to young Black women at conference: 'I want you to be ambitious' Obama calls filibuster 'Jim Crow relic,' backs new Voting Rights Act bill MORE (D-Nev.) said ahead of the vote. “The House, if they are called upon first to sustain the veto, they will do it. If we’re called up on first to sustain the veto, we will do it.”

Republican Sens. Ted CruzRafael (Ted) Edward CruzOn The Trail: Pence's knives come out Pat Fallon wins GOP nomination in race to succeed DNI Ratcliffe The Hill's Morning Report - Presented by the Air Line Pilots Association - Negotiators 'far apart' as talks yield little ahead of deadline MORE (Texas) and Rand PaulRandal (Rand) Howard PaulTrump-backed Hagerty wins Tennessee GOP Senate primary Senators introduce bill to block Trump armed drone sale measure The Hill's Campaign Report: Trump's visit to battleground Ohio overshadowed by coronavirus MORE (Ky.), who are both running for president, were the only Republicans to vote against the bill. Two other 2016 candidates, Sens. Lindsey GrahamLindsey Olin GrahamSeveral GOP lawmakers express concern over Trump executive orders Graham says he appreciates Trump orders, but 'would much prefer a congressional agreement' Sunday shows preview: White House, congressional Democrats unable to breach stalemate over coronavirus relief MORE (S.C.) and Marco RubioMarco Antonio RubioPPP application window closes after coronavirus talks deadlock  The Hill's Campaign Report: US officials say Russia, China are looking to sow discord in election US intelligence says Russia seeking to 'denigrate' Biden MORE (Fla.), didn't vote.

The policy bill has been pulled into the larger battle over the GOP’s budget plan, which would appropriate $38 billion to the Pentagon through a war fund account.

Democrats and the White House say the war fund should not be used to skirt congressional budget caps and are demanding that Republicans negotiate a deal to raise spending across the federal government.

But Republicans, and even some Democrats, have questioned why Obama is poised to veto the NDAA, as the bill authorizes spending without actually appropriating the money.

"You know, I started to have conversation with the White House when we were taking this up in committee, telling them their veto threat was a mistake," said Sen. Tim KaineTimothy (Tim) Michael KaineHillary Clinton roasts NYT's Maureen Dowd over column Ex-USAID employee apologizes, denies sending explosive tweets USAID appointee alleges 'rampant anti-Christian sentiment' at agency MORE (D-Va.), who voted in favor of the NDAA on Wednesday.

"To basically say you'll veto over the [war fund] issue, when we have language in the bill that basically says we should fix the budget caps, I said, 'I think you're drawing the line in the battle at the wrong place.' "

The policy bill has passed Congress for 53 consecutive years, and is typically considered one of the most important legislative tasks for Congress.

Sen. John McCainJohn Sidney McCainBill Maher delivers mock eulogy for Trump Hillary Clinton roasts NYT's Maureen Dowd over column CNN's Ana Navarro to host Biden roundtable on making 'Trump a one-term president' MORE (R-Ariz.), the chairman of the Senate Armed Services Committee, said an Obama veto of the defense bill would be “shameful.”

“If the president vetoes the NDAA, at this time of mounting global threats, he will be prioritizing politics and process over the security of our nation and the well-being of our armed forces.”

Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellTrump signs executive orders after coronavirus relief talks falter Coronavirus deal key to Republicans protecting Senate majority Coronavirus talks collapse as negotiators fail to reach deal MORE (R-Ky.) echoed that criticism Wednesday.

“If he does [veto the bill], it will be the latest sorry chapter in a failed foreign policy based on campaign promises rather than policies to realistically meet the threats before us,” he said.

Obama has threatened to veto the policy bill six times before, primarily due to objections on the transfer of prisoners from the Guantánamo Bay prison facility, but never followed through.

But this year will be different, the administration says, due to the president's strong objections to the use of the war fund.

Press secretary Josh Earnest this week called the GOP plan an “irresponsible way to fund our national defense priorities” and reiterated that Obama would reject it.

Rep. Mac Thornberry (R-Texas), the chairman of the House Armed Services Committee, suggested that if Obama vetoes the bill, it would be different from the four times the NDAA has been vetoed in the past 53 years.

"Every one of them were because of something that was in the bill, not because of something that was outside bill, which is thing the president is complaining about today," he said.

If and when Obama’s veto comes, Republicans are likely to try for an override, though success appears unlikely. The House fell short of the two-thirds majority needed to override a veto when it voted on the NDAA last week. And Sen. Dick DurbinRichard (Dick) Joseph DurbinWhite House officials, Democrats spar over legality, substance of executive orders Sunday shows - Trump coronavirus executive orders reverberate Durbin blasts Trump's 'country-club fix' on unemployment MORE (D-Ill.) warned on Tuesday that Republicans should not assume that Senate Democrats voting for the NDAA would also vote to overturn Obama’s veto.

"If we can't override [a veto] ... outside events will dictate the future and the fate of the legislation," McCain said. "We need 67 in the Senate. It will be very interesting to see how many we hold."

Some military groups have warned Obama against holding the policy bill hostage to the larger funding fight. 

The Military Officers Association of America (MOAA) and the Reserve Officers Association have both sent letters to the president urging him to support the NDAA.

MOAA President Norbert Ryan Jr. said while the concerns about the extra war funding are “legitimate,” the policy legislation “is vital to fulfilling wartime requirements.”

— This story was updated at 5:19 p.m.