Kansas Gov. Sam Brownback, left, says he'd vote for Donald Trump, right, for president if the billionaire New York businessman wins the Republican nomination.

Topeka ? Kansas Gov. Sam Brownback says he’d vote for Donald Trump for president if the billionaire New York businessman wins the Republican nomination.

Brownback said Thursday that he believes Marco Rubio still can win the GOP presidential nomination. Brownback endorsed the Florida senator last week.

But the governor said he will back Trump if Trump wins the nomination, as opposed to either of the two main Democratic candidates.

Brownback said: “I’ll support the Republican nominee over Bernie Sanders or Hillary Clinton.”

Kansas Republicans are holding their presidential caucuses March 5. Many longtime GOP activists are split between supporting Rubio and Texas Sen. Ted Cruz, but believe Trump also has significant support.