ACLU urges Congress members and staff to use encrypted smartphone apps such as WhatsApp and Signal rather than traditional cellular networks. Many members of Congress already have smartphones and the apps like Signal and WhatsApp are free and can be easily downloaded from app stores. ACLU: “Ensuring the security of Congressional communications against all interception would promote both basic liberty interests and national security” The letter comes against the backdrop of compromises of government websites by hackers, including the breach of the computers of the Office of Personnel Management, which exposed sensitive details of millions of federal employees.”]