By Tim Cocks and Alexander Winning

JOHANNESBURG (Reuters) -South Africa's main coalition partners are embroiled in a spat over how to respond to looming tariffs from a hostile Trump administration, after the smaller party said the president's aide was denied a U.S. visa to negotiate with Washington.

The Democratic Alliance said on Tuesday that the United States had formally rejected President Cyril Ramaphosa's chosen interlocutor, Mcebisi Jonas, and had denied him a diplomatic visa in May.

The DA provided no evidence for the claim, which its leading international relations official Emma Louise Powell repeated in a statement on........

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