Duke Buchan III is emerging as Donald Trump’s secret weapon in the presidential-campaign fundraising competition.

       The former hedge-fund manager and major Republican donor who became National Finance Chair of the Republican National Committee in early 2022 is relying on his deep contacts in the financial world and a persistent, low-key approach. Buchan, who grew up on a tobacco-and-cattle farm near Middleburg, N.C., and now lives in Palm Beach, Fla., and New York, has raised tens of millions of dollars, becoming the person most responsible for surging megadonor money, according to people close to the campaign.

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