Why didn't Obama take Trump's offer?

Hi :) I'm not much into politics, but an offer from Trump to Obama recently caught my attention--he promised to donate 5 million dollars to a charity of President Obama's choice if he released his college records...I know a lot of you are thinking (well, if he was a good person, he would've donated the... show more Hi :) I'm not much into politics, but an offer from Trump to Obama recently caught my attention--he promised to donate 5 million dollars to a charity of President Obama's choice if he released his college records...I know a lot of you are thinking (well, if he was a good person, he would've donated the 5 million anyways) I know, I'm one of those people...however, I'm just a little surprised Obama hasn't taken the offer...I know I would've...
So my question is...why hasn't he?
Thanks :)
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