WASHINGTON (AP) — His nomination in peril, Veterans Affairs nominee Ronny Jackson fought Tuesday to convince lawmakers of his leadership abilities as more details emerged over his alleged misconduct, ranging from repeated drunkenness to a toxic work environment, as he served as a top White House doctor. President Donald Trump sent mixed signals about his choice to lead the sprawling veterans’ agency, suggesting during a White House news conference that Jackson may want to withdraw because of unfair scrutiny.