If you want to talk about the constitution, cite what part of it and how it applies to this case.
In the meantime, here's a question for you. Suppose a captured jihadist tells cops that a nuclear bomb is going to explode in New York City (which has extremely high population density) tomorrow. Has capability of killing MILLIONS of people instantly.
Cops could stop it if they knew where to go. Jihadist says he knows, but refuses to tell them. You beat it out of him, or you let millions of people die ? (millions more after radiation spreads).