Donald Trump had a challenge for President Obama and now Dallas Mavericks owner, and "Shark Tank" star Mark Cuban has a challenge for the Donald.
Cuban is offering to donate $1,000,000 to charity if Trump shaves his head.
Last month Trump offered $5,000,000 if president Obama would produce his college transcripts and passport applications. Click here to view the previous story.
The Obama administration never responded and so far, Trump has not responded to Cuban's offer either.