MADBURY, N.H. — The Kremlin hacked our presidential election, is waging a cyberwar against our NATO allies and is probing opportunities to use similar tactics against democracies worldwide. Why then are federal agencies, local and state governments and millions of Americans unwittingly inviting this threat into their cyber networks and secure spaces? That threat is posed by antivirus and security software products created by Kaspersky Lab, a Moscow-based company with extensive ties to Russian intelligence. To close this alarming national security vulnerability, I am advancing bipartisan legislation to prohibit the federal government from using Kaspersky Lab software. Kaspersky Lab insists...