The Foreign Intelligence Surveillance Court received 1,752 applications for wiretaps and other surveillance in 2016.
It granted 1,378 of those requests; 26 others were partially denied, and 339 were modified, according to the report released yesterday, the first year-long accounting of the court's work.
The 2015 report only represents the last six months of that year, but notes the court denied five applications.
The court approves highly secretive warrants in the most sensitive of FBI investigations, and the report does not offer any insight into its classified process or any of the applications it received. But it offers a small peek into its work, which has taken on particular importance with ongoing investigations into whether President Donald Trump's campaign had ties to Russia's meddling in the 2016 election.
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The Washington Post was first to report that the FBI obtained a secret order from the court last summer to monitor the communications of Carter Page, an adviser to then- candidate Donald Trump, because the government had reason to believe Page was acting as a Russian agent.
The ambassador, Sergey Kislyak, was being monitored through the Foreign Intelligence Surveillance Act, the 1978 law that created the court.
It differs from a regular criminal warrant because it does not require the government to provide probable cause that a crime has occurred. Instead, under FISA, the government must simply provide evidence that the target of an investigation is an agent of a foreign power.
The Justice Department applies for the warrants in a one-sided process before the court's judges. Permission is granted if a judge agrees there's probable cause that the target is an agent of a foreign power.