Allegations that Amazon.com boss and Washington Post owner Jeff Bezos had his phone hacked by Saudi Crown Prince Mohammed bin Salman have put a spotlight on the security of smartphones and the secretive tools used to hack them.

U.S. President Donald Trump on Friday discussed the security of telecommunications networks with British Prime Minister Boris Johnson, the White House said, as Britain nears a decision on Huawei’s role in the country’s future 5G network.

The U.S. Commerce Department has withdrawn a rule aimed at further reducing sales to China’s Huawei Technologies amid concerns from the Defense Department the move would harm U.S. businesses, people familiar with the matter said.