FILE - Republican presidential candidate businessman Donald Trump speaks in Derry, N.H. Trump has until Sept. 30 to pledge to rule out a third-party run if he intends to appear on the South Carolina primary ballot. (AP Photo/Mary Schwalm, File)
FILE - Republican presidential candidate businessman Donald Trump speaks in Derry, N.H. Trump has until Sept. 30 to pledge to rule out a third-party run if he intends to appear on the South Carolina primary ballot. (AP Photo/Mary Schwalm, File)