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    TikTok CEO to appear before Congress amid growing security concerns

    04:18
  • Foreign adversaries not responsible for 'Havana syndrome,' say U.S. intel agencies

    03:21
  • China-linked hackers targeted 39 industries on most continents in 2022, report finds

    03:23
  • Biden ordered unidentified aerial objects taken down out of 'abundance of caution'

    04:31
  • U.S. military takes down second 'high-altitude object' over Alaska, origin unknown

    03:43
  • Chinese balloon had antennas capable of collecting signals intelligence

    02:49
  • DHS issues domestic terror threat warning to LGBTQ, Jewish and migrant communities

    04:18
  • House Homeland Security Committee holds hearing on worldwide threats

    03:46
  • Biden's national security adviser Sullivan acknowledges communications with Russia

    01:36
  • CIA honors Harriet Tubman as model spy with statue

    00:53
  • Justice Dept. charges three Iranians with hacking computer networks in global scheme

    01:43
  • Extradition of Julian Assange to the U.S. approved by British government

    02:38
  • Plot by ISIS operative to assassinate former Pres. George W. Bush foiled by law enforcement

    02:01
  • Justice Dept. announces criminal charges against Chinese government over efforts to intimidate

    02:52
  • CIA director: 'Putin has no endgame' in Ukraine as intel shows up to 4,000 Russian soldiers killed 

    03:01
  • White House: Putin 'improvising' Ukraine strategy, was not prepared for U.S. intel

    01:50
  • Russian military exercises in Belarus ‘will continue indefinitely’

    03:00
  • Richard Engel: War 'may be starting right now'

    02:42
  • The lights are blinking red all over Europe

    01:22
  • CIA delivers warning to Russia of consequences over 'Havana Syndrome'

    03:28

Surveillance prevented at least 10 U.S. terror attacks, NSA says

03:14

The director of the National Security Agency, Gen. Keith Alexander, defended the controversial surveillance programs exposed by Edward Snowden and revealed details of two previously unreported cases he said were cracked with the help of the programs. NBC’s Andrea Mitchell reports.