No. You may be thinking about the leaked email to Hillary Clinton? This was an email to her, not from her, and one of thousands of emails she received. It’s not too surprising that someone in her position would receive an email from someone about “Nibiru”. The idea is utter BS and nuts and I’m sure she wouldn’t take it seriously for a moment, nor would President Obama.

We also get a lot of “fake news” about Nibiru, e.g. fake news that the Pope or Putin or - name any famous figure, add the word Nibiru and you end up with a fake news story that someone might fall for.

For how we know it's nonsense:

Debunked: Nibiru will hit Earth on [Insert Date here]

And my Nibiru BS tester to check if they know anything about astronomy

Nibiru Bullshit Tester - How to check if they know anything about astronomy