Sen. Richard Shelby (R-Ala.) says he plans to vote to confirm former Sen. Chuck HagelCharles (Chuck) Timothy HagelShould Mike Pompeo be confirmed? Intel chief: Federal debt poses 'dire threat' to national security Hagel: Trump is 'an embarrassment' MORE (R-Neb.) as secretary of Defense, bolstering the embattled nominee who has faced sharp GOP opposition.

"He’s probably as good as we’re going to get," Shelby said on Wednesday, according to The Decatur Daily.

Shelby's office confirmed that the senator from Alabama would back Hagel, provided there are no unexpected developments ahead of the vote.

"Yes, barring any unforeseen surprises brought to light before the vote, Sen. Shelby intends to support the nomination," Shelby spokesman Jonathan Graffeo confirmed to The Hill.

Senate Republicans last week blocked Hagel’s confirmation in a first-ever filibuster of a Defense nominee, after Democrats failed to win the 60 votes needed for cloture.

GOP lawmakers had demanded more information from Hagel and said delaying his confirmation would provide more time for them to weigh the nomination.

Senators are seeking access to his personal financial records to settle questions about whether he received foreign funding for paid speeches. In addition, some have raised questions about a speech in 2010 in which Hagel is alleged to have said that the State Department was controlled by Israel.

But over the weekend, the opposition to Hagel appeared to soften, with many senators who voted to block him last week saying that they would allow his confirmation to proceed to a final vote.

Sen. John McCainJohn Sidney McCainGOP moves to cut debate time for Trump nominees GOP advances proposal to change Senate rules Julian Castro predicts Arizona will 'go blue' for Senate, presidential election MORE (R-Ariz.), one of Hagel’s harshest critics, on Sunday conceded that the nominee was likely to secure enough votes for confirmation. Once the Senate ends debate on Hagel, he would only need a majority of 51 votes to win confirmation.

Shelby is the third Republican to publicly back Obama’s pick to head the Pentagon, joining Sens. Thad CochranWilliam (Thad) Thad CochranChamber of Commerce makes play in Mississippi Senate race for Hyde-Smith Shelby approved as Appropriations panel chairman Cindy Hyde-Smith sworn in as Mississippi's latest senator MORE (Miss.) and Mike JohannsMichael (Mike) Owen JohannsMeet the Democratic sleeper candidate gunning for Senate in Nebraska Farmers, tax incentives can ease the pain of a smaller farm bill Lobbying World MORE (Neb.) who said they would vote to confirm him.

He did not join the four other Senate Republicans: Cochran, Johanns and Sens. Susan CollinsSusan Margaret CollinsGOP moves to cut debate time for Trump nominees GOP senator: 'We were there' on immigration before talks got derailed GOP advances proposal to change Senate rules MORE (Maine) and Lisa MurkowskiLisa Ann MurkowskiOvernight Energy: Pruitt proposes rule targeting 'secret science' | Dems probe Pruitt's security chief | FAA bill provisions could strip endangered species protections Senators press administration on mental health parity Overnight Energy: Watchdogs unveil findings on EPA, Interior controversies | GAO says EPA violated law with soundproof booth | IG says Zinke could have avoided charter flight | GOP chair probes Pruitt's four email addresses MORE (Alaska) who voted for cloture on Hagel's nomination last week.

The White House has also expressed confidence that Hagel will eventually be confirmed, but on Sunday, Obama chief of staff said he had “grave concern” over the delay, which he warned could threaten national security.

Shelby also said he will vote in favor of former White House Chief of Staff Jack LewJacob (Jack) Joseph LewOvernight Tech: EU investigates Apple's Shazam buy | FCC defends GOP commissioners CPAC visit | Groups sue FTC for Facebook privacy records | A big quarter for Google Treasury pushes back on travel criticism with data on Obama-era costs Big tech lobbying groups push Treasury to speak out on EU tax proposal MORE's nomination for secretary of the Treasury.

"I've known him a long time," Shelby said, according to the Alabama newspaper, referring to Lew. "I think he's honest and I think he's capable."