Would Donald Trump shave his head for $1 million?
That's how much Mark Cuban, owner of the Dallas Mavericks, has offered to donate to charity if Trump takes him up on the challenge.
Cuban's offer follows the one issued by Trump last month. The real estate mogul had offered to give $5 million to charity if President Barack Obama produced college transcripts and passport applications by the end of October.
The Obama administration never responded.
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So far, Trump hasn't responded to Cuban's offer either.