Christie announces his candidacy at 11 a.m. in Livingston, N.J., before heading to Sandown, N.H., for a town hall at 6 p.m.
Rick Santorum participates in a national security town hall in Charleston, S.C., at 12:30 p.m.
Bobby Jindal holds three events in Iowa beginning at 1:30 p.m.
Mike Huckabee hosts a grand opening for his campaign's Iowa headquarters in Urbandale at 6:30 p.m.
Rand Paul holds a fundraiser at the Cannabis Business Summit in Denver.