US primaries: Nikki Haley loses support from the influential Koch network. Haley wants to last at least until Super Tuesday Many conservatives fear that the ex-president could lose to incumbent Joe Biden as a candidate in the presidential election on November 5th.

Trump seems to be unstoppable: The 77-year-old has won the four previous primaries in the states of Iowa, New Hampshire, Nevada and, most recently, South Carolina. It's only a matter of time before Haley, the last remaining serious Trump opponent, throws in the towel.