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What is the FISA court, and why is it so secretive?

(CNN) -- It's a highly fortified courtroom where some of the most secretive government decisions get made. And you might never have heard of it.

But in the coming days, the Foreign Intelligence Surveillance Court -- known as the FISA court or FISC -- will get more attention after President Donald Trump claimed he was wiretapped during the Obama administration. (Trump has not offered any evidence supporting his claim.)

So how exactly does the court work? And why does it have a cont

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