U.S. | Fri Jun 9, 2017 | 5:58pm EDT

NSA backtracks on sharing number of Americans caught in warrant-less spying

By Dustin Volz | WASHINGTON

For more than a year, U.S. intelligence officials reassured lawmakers they were working to calculate and reveal roughly how many Americans have their digital communications vacuumed up under a warrant-less surveillance law intended to target foreigners overseas.

This week, the Trump administration backtracked, catching lawmakers off guard and alarming civil liberties advocates who say it is critical to know as Congress weighs changes to a law expiring at the end of the year that permits some of the National Security Agency's most sweeping espionage.

"The NSA has made Herculean, extensive efforts to devise a counting strategy that would be accurate," Dan Coats, a career Republican politician appointed by Republican President Donald Trump as the top U.S. intelligence official, testified to a Senate panel on Wednesday.

Coats said "it remains infeasible to generate an exact, accurate, meaningful, and responsive methodology that can count how often a U.S. person's communications may be collected" under the law known as Section 702 of the Foreign Intelligence Surveillance Act.

He told the Senate Intelligence Committee that even if he dedicated more resources the NSA would not be able to calculate an estimate, which privacy experts have said could be in the millions.

[font size=1]-snip-[/font]