WASHINGTON — Senate leaders have delayed indefinitely the confirmation hearing for President Donald Trump’s pick to be Veterans Affairs secretary amid late-surfacing allegations about the nominee’s workplace practices and growing questions about his ability to manage the government’s second-largest department.

The hearing for Ronny Jackson, Trump’s White House doctor and a Navy rear admiral, which had been set for Wednesday at the Senate Veterans Affairs Committee, was indefinitely postponed

“We take very seriously our constitutional duty to thoroughly and carefully vet each nominee sent to the Senate for confirmation,” said the chairman, Sen. Johnny Isakson, R-Ga., and the top Democrat on the committee, Sen. Jon Tester of Montana. “We will continue looking into these serious allegations and have requested additional information from the White House to enable the committee to conduct a full review.”

Isakson told fellow GOP senators over the weekend about the allegations against Jackson prompting those on the panel to give their support for delaying the hearing, one senator said.

“We’ve got 360,000 people there. Are they going to manage the secretary or is the secretary going to manage the VA?”

“Chairman Isakson had a phone conversation with a lot of us around the committee over the weekend, indicated that there had been some unsubstantiated allegations made, and he wants to do it right,” said Sen. Mike Rounds, R-S.D. on Fox News @ Night With Shannon Bream.

“We told him that if he wanted to delay the meeting, that was fine with us. We most certainly want to get all the facts out,” he said.

Allegations began surfacing late last week involving Jackson’s workplace practices, including claims of inappropriate behavior and over-prescribing prescription drugs, according to two aides granted anonymity to discuss the situation.

Democrats on the committee assembled privately late Monday. Tester reiterated to the other senators that the allegations were out there, one aide said. But no specific evidence of wrongdoing was offered.

White House and VA officials were quietly discussing a delay with key allies outside the administration, even as White House spokesman Hogan Gidley on Tuesday praised Jackson’s nomination.

“Admiral Jackson has been on the front lines of deadly combat and saved the lives of many others in service to this country. He’s served as the physician to three Presidents_Republican and Democrat_and been praised by them all,” he said. “Admiral Jackson’s record of strong, decisive leadership is exactly what’s needed at the VA to ensure our veterans receive the benefits they deserve.”

Trump selected Jackson to head the VA last month after firing former Obama administration official David Shulkin following an ethics scandal and mounting rebellion within the agency. But Jackson, who has worked as a White House physician since 2006, has faced numerous questions from Republican and Democratic lawmakers as well as veterans groups about whether he has the experience to manage the massive department of 360,000 employees serving 9 million veterans.

Late Monday, Jackson was still pursuing support, and held a late-afternoon conference call with veterans groups from West Virginia and the state’s Democratic Sen. Joe Manchin, a member of the committee, whose vote could be vital for support.

Rounds said Jackson’s small staff at the White House will be an issue as he prepares to lead the VA.

“We’ve got 360,000 people there,” he said. “Are they going to manage the secretary or is the secretary going to manage the VA? That’s a good question to ask, and he needs to answer it. He needs to be the leader. A lot of folks want to be led and managed.”

Rounds said the committee still needs more paperwork from the White House on Jackson before the nomination can go forward.

Associated Press writer Matthew Daly contributed to this report.