How to get rid of ants from coming through the bathroom sink?!?!?

We have had ant problems in our bathroom! One day I watched the sink for like 20 seconds and ants start coming out! I don't know how to get rid of them! Any suggestions?! Thank you!

(for the person who answered my last question EXACTLY like this one, as you can see I posted where they were coming from twice. THE BATHROOM SINK!)
From drain

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