National Security Advisor Michael Waltz looks at his phone as he prepares for a TV interview at the White House on May 01, 2025 in Washington, DC. Andrew Harnik | Getty ImagesThe messaging app that President Donald Trump's former national security advisor was seen using during a Cabinet meeting last week is temporarily suspending services following a reported hack, its parent company said Monday."TeleMessage is investigating a potential security incident," a spokesperson for Smarsh, which runs t...