End of Robert Mueller's investigation leaves unfinished business

Special counsel Robert Mueller’s report on the lack of collusion between the Trump campaign and Russia has revealed an urgent need to rein in the highly secretive Foreign Intelligence Surveillance Act court.

The FISA court typically operates in the shadows, though it occasionally surfaces in the news when it becomes entangled in political issues, such as the debate over government surveillance in the wake of Sept. 11, or when it authorizes spying on a presidential campaign organization, as it did with regard to the Trump campaign.