After Dr. Ronny Jackson withdrew his nomination to lead the Department of Veterans Affairs amid claims of improper conduct on the job, the White House argues officials haven't found evidence indicating one of the most serious allegations ever happened.
Tester said he had compiled accusations against Jackson based on more than 20 current and former military members.
"Allegations made by Senator Jon Tester against Admiral/Doctor Ron Jackson are proving false", Mr. Trump tweeted Saturday.
Prior to his withdrawal, Senate Veterans Affairs Committee members were assessing allegations from whistleblowers who have told the panel about Jackson's questionable behavior including excessive drinking and a "toxic" work environment under his leadership, according to two former White House medical staff members who have spoken with the committee.
Jackson withdrew his nomination following several reports from congressional Democrats alleging that Jackson drank excessively on the job, was lax in handing out prescriptions for sleeping aids and mistreated his employees.
At a Secret Service going-away party, the summary says, Jackson got drunk and wrecked a government vehicle.
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Internal records, including police reports, show that Jackson was in three minor vehicle incidents in government vehicles during the last five years, but none involved the use of alcohol and he was not found to be at fault.
Trump blasted Tester for "nicknames" like the Candyman, a reference to allegations Jackson liberally handed out Ambien to staffers on planes.
Tester did not immediately respond to a request for comment.
White House officials say they are taking a new look at the way nominees' backgrounds are checked - and they believe they will persuade Trump to take additional time to ensure that a replacement is sufficiently vetted.
"Over the last 48 hours, media outlets have alleged that U.S. Secret Service personnel were forced to intervene during a Presidential foreign travel assignment in order to prevent disturbing (former) President Barack Obama", The Secret Service released in a statement. He also praised Jackson, who has worked as a White House physician for 12 years, as an "American hero" for exposing what he described as maliciousness in Washington.
Press secretary Sarah Huckabee Sanders said Jackson was back at work at the White House on Thursday.
Jackson has denied the accusations, calling them "baseless and anonymous attacks" on his character and integrity that are 'completely false and fabricated'. Cosgrove recently retired as CEO of the Cleveland Clinic, an OH academic hospital, and has twice been considered for the VA secretary job, by Trump in 2016 and former President Barack Obama in 2014.