The campaign for GOP presidential candidate Sen. Marco Rubio (R-Fla.) is now actively urging Ohio Republicans not to vote for him in the state's primary next week.

Primary voters in Ohio should unite behind the state's governor, John Kasich, if they want to beat overall GOP front-runner Donald Trump, Rubio spokesman Alex Conant said Friday on CNN. His was an out-of-the-ordinary comment in an out-of-the-ordinary race that is leaving many Republicans struggling to come up with a plan to avoid Trump getting the nomination.

Attempting to solve the current collective action problem among the non-Trump candidates, the Rubio camp has encouraged Florida Republicans who don't support Trump -- including those who prefer Kasich -- to vote for the senator. Then Rubio supporters in Ohio should vote for Kasich, Conant said.

"My answer is John Kasich is the one candidate in Ohio that can beat Donald Trump," he explained. "That's stating the obvious. If you're a Republican primary voter in Ohio and you don't want Donald Trump to be the nominee, John Kasich is your best bet. If you're a Republican primary voter here in Florida and you don't want Donald Trump to be your nominee, Marco Rubio is your best bet. That is indisputable. Everybody would say that."

In Florida, Rubio is "the only one with a mathematical shot, and if you look at the polls and the early voting, a very good shot, of beating Donald Trump," Conant added.

Polling indicates that Conant is right on at least part of that equation: Rubio isn't going to win Ohio, and Kasich isn't going to win Florida. 

Rubio is polling at under 7 percent in Ohio, according to HuffPost Pollster averages, compared to about 35 percent for Kasich, about 30 percent for Trump and about 17 percent for Texas Sen. Ted Cruz.

Trump is leading Rubio by wide margins in Florida, which also holds its primary on March 15. HuffPost Pollster averages indicate support for Trump at nearly 40 percent in the state, while Rubio is in second at about 27 percent. Cruz has support from 17 percent of Florida Republicans, followed by Kasich at about 10 percent.

Rubio told reporters at a press conference after Conant's comments that he had not talked to Kasich about the matter, but didn't object to the idea of his supporters voting for the Ohio governor over him. 

"If a voter in Ohio is motivated by stopping Donald Trump and comes to the conclusion that John Kasich is the only one to beat him there, then I expect that's the decision they'll make," Rubio said. "I can tell you in Florida, I'm the only one that can beat Donald Trump."

Kasich's campaign dismissed the idea of his supporters voting for Rubio in Florida, according to Associated Press reporter Kathleen Ronayn.