ST. PETERSBURG, June 6 -- The case for Donald Trump as a Nobel Peace laureate found an unlikely advocate on the final day of Russia's flagship economic forum, where Errol Musk, the South African businessman and father of Elon Musk, told reporters he believed the American president had done more for global stability than anyone the Norwegian committee was likely to consider.

"Donald Trump is most likely the best candidate to receive the Peace Prize," Errol Musk said on the sidelines of the St. Petersburg International Economic Forum, speaking to RIA Novosti. "That's the person who's trying the best to make things normal in the world."

The remark was not offered as a casual opinion. Errol Musk grounded it in what he described as a definin...