Jon Ralston, known as the dean of the Nevada press corps, thinks Donald Trump will have no trouble winning in his state's GOP caucus Tuesday.

"Donald Trump is going to win Nevada easily," veteran journalist Jon Ralston said Sunday on "Meet The Press."

"There are no rules anymore," Ralston said. "The old math doesn't work."

Host Chuck Todd noted that Nevada was long thought to be the state where Sen. Marco Rubio, R-Fla., would score his first win. Establishment Republicans hope that Rubio, who picked up an endorsement Saturday from Sen. Dean Heller, can consolidate anti-Trump Republicans in the state.

Ralston dismissed the notion.

"He's not going to win," Ralston said. "He'll be lucky to finish second."