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On Assignment

"On Assignment" May 8th

Last Sunday, May 8th, "On Assignment"...

Watch the full episode of the Sunday, May 8th "On Assignment" here.

Guccifer

Cynthia McFadden, left, with the Romanian hacker Guccifer in Romania. NBC News

Cynthia McFadden heads to Romania to interview an unlikely figure at the center of the Hillary Clinton email controversy. Marcel Lehel Lazar, who uses the devilish handle Guccifer, is making a bombshell claim - saying not only did he gain access to Clinton's private email address, but that he has been inside the former Secretary of State's "completely unsecured" server. Brian Fallon, national press secretary for Clinton's presidential campaign, says Guccifer's claims are baseless.

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New Claims From Hacker Who Exposed Clinton's Private Email 3:44

Life or Death Decisions

Keith Morrison brings you the story surrounding one of the most wrenching ordeals a family can go through: Deciding whether to take a loved one suffering from a traumatic brain injury off life support. There is new information that challenges conventional thinking about when that life or death decision should be made. In certain types of cases, the brain may be far more resilient than we know.

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Life or Death Decisions: The Brain's 'Self-Repair" Process May Go On for Years 1:18

Mystery Apes of the Congo

Richard Engel takes you deep into the Bili Forest in war-torn Congo, in search of a rare, endangered population of apes, almost impossible to see.

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Mystery Apes of the Congo: Preparing for the Journey into the Forest 2:04

"On Assignment" airs Sundays at 7 p.m. ET/6 p.m. CT.