Jackson himself, though, said there was no inspector general report about the allegations.
Blumenthal says he thinks there may well be a need for more time, in fairness to Jackson, so that he and the administration have an opportunity to answer these questions fully and fairly.
"I told Admiral Jackson just a little while ago, I said, 'What do you need this for?' " said Trump, who met with Jackson earlier in the day in the Oval Office. "I don't want to put a man through - who's not a political person - I don't want to put a man through a process like this".
Trump says in a joint news conference with French President Emmanuel Macron that he will "stand behind" his VA nominee but it's "totally his decision" on whether he should try to win confirmation in the Senate.
The detailed allegations came hours after Trump cast doubt on whether Jackson should remain the nominee for secretary of veterans affairs but said the decision was up to Jackson.
In addition to Jackson's lack of management experience at a large organization, the physician had come under fire for his glowing appraisal of Trump's health after the president had his annual physical in January. Instead, the officials insisted Jackson would push back forcefully and said Trump was not wobbling over his selection. In fact, you had President Obama basically saying that Admiral Jackson was poised under pressure, that he should be promoted.
The senior White House official's message took on both allegations. "This is a vicious group of people that malign, and they do, and I lived through it, we all live through it".
Those allegations against Dr. Ronny Jackson include over-prescription of drugs, creation of a hostile work environment and drinking on the job.
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The Jackson controversy comes as two other Trump nominees - Mike Pompeo for secretary of state and Gina Haspel for CIA director - face Senate grillings, and Environmental Protection Agency chief Scott Pruitt faces mounting accusations of ethical misconduct and misuse of taxpayer money.
Jackson denied the allegations during a private meeting with Sen.
This drew more scrutiny and prompted Senator Isakson (R) of Georgia, Chairman of the Veteran Affairs Committee, and his Democratic counterpart to jointly send a letter to the White House asking for more information. "Let Dr. Jackson have his hearing".
The Montana Democrat told CNN's Anderson Cooper that around 20 people raised concerns to his committee about Rear Adm. Ronny Jackson, and according to those people, Jackson would hand out prescriptions "like candy". But if this is accurate, why did President Obama promote him? But he said because of the administration's "quick, sloppy vetting process", the Senate job of vetting nominees "is more important than ever before".
But the allegations that surfaced Tuesday morning and then Trump's signaling he would be fine with Jackson stepping aside created a firestorm on Capitol Hill.
Asked if Jackson's nomination is still viable, Isakson responded, "We'll see". It seeks any communication between the Pentagon and the White House regarding "allegations or incidents" involving him.
The White House released several other reports that were laudatory toward Jackson late Tuesday, including his performance reviews for the past four years. There may be more to learn from the documents the White House produces.
Both sources who spoke with CNN told the committee about behavior they observed while working in the White House medical unit.