The latest on the Pentagon, State Department, Department of Homeland Security and national security.
Russia investigations face critical week in Congress
By Tom LoBianco, CNN
Russia fight threatens intel panel's work
Partisan split at House intel committee over canceled open hearing
Sources: FBI investigates 'odd' computer link
AQAP trying to hide explosives in laptop batteries, official says
Roger Stone, Carter Page volunteer to talk to House committee
House Intel chairman: Trump's personal communications may have been collected
Manafort pushes back on report he worked to help Putin's government
The super-secret division in charge of the Russia investigation
Ukrainian FM warns Congress: 'Everyone is vulnerable' to Russia
US Marines join local forces fighting in Raqqa
'Unmasking,' FISA and other terms to help you understand the wiretapping story
What is the FISA court, and why is it so secretive?
Meet CNN's security team
Paul Manafort's Russia connections
Why is the government searching cellphones?
Who is Devin Nunes
US Air Force considers dumping undefeated fighter jet
US official says there's a 'fair chance' airstrike killed civilians in Mosul
6 Obama climate policies that Trump orders change
India wants to seal its borders with Pakistan and Bangladesh
White House denies it sought to prevent Yates' testimony
White House evasive as House Intelligence Committee grinds to a halt
Portland 'Dreamer' released on bond after being arrested by ICE agents
Will Iraq survive victory over ISIS in Mosul?
Russian banker who met with Jared Kushner has ties to Putin
A walk through the devastation of West Mosul
There's a Russian storm over Trump's struggling presidency
McCaskill to CBP: Will wall cost $70 billion?
White House looks at stepping up military role in Yemen
Cmdr.: Fair chance US airstrike hit civilians
Coming March 31: ISIS: Behind the Mask
On the ground in Mosul
The challenges surrounding the Raqqa offensive