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    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
  • Former CIA officer says traditional spying is 'dead' due to technology, internet

    04:41
  • Biden announces new defense agreement with U.K., Australia

    03:38
  • How September 11 changed security in America

    01:45
  • Honoring the 13 U.S. service members who lost their lives in the Kabul airport terror attack

    00:23
  • McMaster: Afghanistan 'a one-year war, fought 20 times over'

    01:20
  • Blinken: 'Deeply sorry' to parents of fallen soldiers of Kabul attack

    01:29
  • Blinken: U.S. 'not likely' to have diplomatic presence in Afghanistan after Sept. 1

    00:46

Authorities investigating if Boston suspect had training

02:40

The big question for lawmakers is whether or not Tamerlan Tsarnaev received training during his 2012 visit to Dagestan, NBC’s Michelle Franzen reports.