WASHINGTON (AP) — Presidential election campaigning is revving back up. Donald Trump heads on Tuesday to Michigan and Vice President Kamala Harris answers questions at a Black journalists forum in Pennsylvania. Their travels come even as authorities continue to investigate a second apparent assassination attempt against Trump that's roiled the race. Trump is holding a town hall in Flint, Michigan, and has appearances later in the week in New York, Washington and North Carolina. Harris will participate in a Philadelphia gathering of the National Association of Black Journalists. That follows a recent appearance before the group by Trump that sparked an uproar when he questioned the vice president's racial identity.