The presentation is an 11th-hour rebuttal to the fatalism permeating the Republican establishment: Slide by slide, state by state, it calculates how Donald Trump could be denied the nomination.

Marco Rubio wins Florida. John Kasich wins Ohio. Ted Cruz notches victories in the Midwest and Mountain West. And the results in California and other states are jumbled enough to leave Trump three dozen delegates short of the 1,237 required — forcing a contested convention in Cleveland in July.

The slide show, shared with The Washington Post by two operatives advising one of a handful of anti-Trump super PACs, encapsulates the newly emboldened view of many GOP leaders and donors. They see a clearer path to stopping Trump following his two losses and two narrower-than-expected wins on Saturday.

In private conversations in recent days at a Republican Governors Association retreat here in Park City and at a gathering of conservative policy minds and financiers in Sea Island, Ga., there was an emerging consensus that Trump is vulnerable and that a continued blitz of attacks could puncture the billionaire mogul’s support and leave him limping onto the convention floor.