Nevada's primary is here, but that doesn't mean former South Carolina Gov. Nikki Haley and former President Donald Trump are going head to head at the ballot box. The Silver State is holding a Republican primary on Tuesday, but Haley is the only major candidate participating. Trump this year opted for Nevada's caucus, which is run by the Republican Party. That means the two won't go face off until the South Carolina primary later this month. President Joe Biden is also expecting to notch a win Tuesday in Nevada's Democratic primary, as his challengers struggle to pick up steam across the country.