Apparently gearing up for a new potential rival in the presidential race, Donald Trump at a weekend rally slammed Vice President Kamala Harris as “crazy” and “nuts.” “Kamala, I call her ‘laughing Kamala,'” Trump scoffed in Grand Rapids, Michigan, on Saturday. “Have you seen her laughing? She is crazy. You can tell a lot by a laugh. She is nuts.” The slam at Harris is a Trump signature attack he usually reserves for women that focuses on stupidity and hysteria — and looks. Underscoring that bent, Trump noted at the rally that Harris is “not as crazy” as former House Speaker Nancy Pelosi (D-Cali…