Trump regularly speaks with reporters at campaign events and often takes multiple questions in an impromptu manner, making his silence Friday all the more noticeable.

When asked by CNN after a rally at a local high school here if he thought the attacks were George W. Bush’s fault, Trump, after pausing to listen to the question, walked away.

Minutes later, he again declined to say anything when asked to react to Bush’s response on Twitter, ignoring at least half a dozen questions on the matter before driving away in his motorcade. He did respond to questions about the crowd size at his campaign event Friday and why he was campaigning in Massachusetts.