O estás conmigo o estás contra mí.

English Translation

You’re either with me or you’re against me.

Shouldn’t it be contra de mí?

Either “contra mí” or “en contra de mí”.

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English Translation

You’re either with me or you’re against me.

Other alternatives are “en mi contra”, and “en contra mía”.

https://www.rae.es/dpd/contra

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