1) He’s a former Democratic President who made policy decisions (NAFTA, Welfare Reform, the Crime Bill) that are still affecting the country today. It’s altogether fitting and proper to ask the current nominee of the Democratic Party whether she agrees with those policies, whether they’ve proven to be mistakes over time, and what if anything she would change about them. And;
2) Hillary Clinton was never a traditional First Lady. She was, and was presented to the public as, a trusted policy advisor to Bill. She was in charge of his disastrous healthcare reform effort. Just like any other former Clinton Administration figure, it’s entirely right both to hold her accountable for his policies she agreed with and press her on which of his policies she would change, if any.