ELKO, Nevada — Republican presidential candidates took last-minute appeals for support across the breadth of Nevada, jockeying for votes with unabashed critiques of their White House rivals.

Front-runner Donald Trump delivered a broadside against competitor Ted Cruz, telling thousands in Las Vegas he thinks the Texas senator “is sick.”

“There’s something wrong with this guy,” said Trump.

For his part, Cruz spent significant time Monday seeking to explain the ouster of his spokesman for tweeting a story that falsely accused White House hopeful Marco Rubio of insulting the Bible. And when the candidates weren’t directing their fire at each other, they used scattered appearances on the eve of Tuesday’s caucuses to assail Democratic candidate Hillary Clinton.

So raucous was this day that Trump stopped short at one point in his talk to bemoan the very delegate-selection he was in Nevada to tap.

“Forget the word caucus,” he told a crowd of some 5,000. “Just go out and vote, OK?” At another point, he said, “What the hell is caucus?”