HOLLYWOOD, Fla. — Republican delegates, poised to wield real power for the first time in decades, could toss front-runner Donald Trump at a contested convention and elevate one of his underdog rivals to the presidential nomination.

But as the delegates game out scenarios for an unpredictable floor fight, they concede that there’s no way to know if they’ll embrace the power to pick the nominee granted to them under GOP rules, or fold under immense public and private pressure and throw the GOP nod to Trump, the likely top candidate in raw votes and primaries won.