WASHINGTON — President Donald Trump’s boycott of this weekend’s Group of 20 summit in South Africa leaves the forum fumbling to divine his latest intentions on the global stage without a U.S. representative for the first time since its inception.

But world leaders can find insight in the foreign policy machinations of the U.S. president’s top two lieutenants: Vice President JD Vance and Secretary of State Marco Rubio. Although those around them insist that there’s no mutual rivalry, it hasn’t curbed their boss’ impulse to fuel an “Apprentice”-style contest on the global stage.

Both the Republican stars, who each have chased White House dreams, have closely aided Trump as he sketches out the bones of a new foreign policy. Paying attention to their divergent styles and interaction offers c

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