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Donald Trump's Inaugural Committee doesn't want to say who is performing at the inaugural balls ... but one of the singers sure does.

Gospel and Grammy nominated singer Travis Greene -- who will open the Liberty Ball -- says God told him to perform, and he has no reservations.

He told us he's getting blowback on social media, but he's figured out a way to deal with it. For the record, his team tells us he's also getting support for his decision.