The issue focused on whether the federal government can collect data from private companies, such as Google and Facebook, without a warrant. The court also heard evidence from the FBI's use of a "trap and trace" program to track the online activity of suspected terrorists online.

It could also help the courts decide whether to grant Apple the same right to collect data collected by the FBI.

The court heard evidence from the Bureau that tech companies have been reluctant to share customer data.

"The government is