The Senate Veterans Affairs Committee is examining allegations that President Trump’s nominee to lead the Veterans Affairs Department oversaw a hostile work environment as the White House physician and allowed the overprescribing of drugs. They have also received claims that Dr. Ronny L. Jackson drank too much on the job. The allegations, which have been under investigation since last week, forced the postponement of Dr. Jackson’s confirmation hearing, planned for this Wednesday as senators scrutinize the nominee’s time leading the White House medical staff.