I agree with both of the answers above, it will raise a red flag. You need to specifically declare your intention of seeking an asylum upon port of entry.
Seeking asylum after making declarations in your tourist visa interview that you did not intend to stay in the US is indicative of misrepresentation. However, that misrepresentation, strictly speaking, will not prevent you from getting asylum if you have a valid claim. However, once it's been established that you've committed a misrepresentation, your representations in the asylum claim could become suspect. That being said - this how people often seek asylum though - so you're plan is not entirely outside of the norm. You should get a lawyer before, during, and after your entrance.
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You will be engaging in immigration fraud which you can avoid if you declare your asylum intentions at the airport and go through the process of credible fear interview.
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