(CNN) Rear Adm. Ronny Jackson, President Donald Trump's pick to head the Department of Veterans Affairs, was allegedly "abusive" to his colleagues, loosely handled prescription pain medications and was periodically intoxicated, even crashing a car once while drunk, according to allegations detailed in an explosive document compiled by Senate Democrats.

The document, written by Democratic staff on the Senate Veterans Affairs Committee, lists a range of allegations detailed by what they say are 23 current and former colleagues of Jackson.

Lawmakers have not yet substantiated these details and are investigating them further.

Among the most damaging allegations: Jackson was drunk and "wrecked a government vehicle" while at a going-away party. It also says that "on at least one occasion" Jackson "could not be reached when needed because he was passed out drunk in his hotel room."

The documents did not include further significant details, the document states, in part to "protect the identities of those involved."

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