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Hacker 'Guccifer': I got inside Hillary Clinton's server

The Romanian hacker who exposed Clinton's private email address claims he also gained access to the former secretary of state's "completely unsecured" server.
Marcel Lazar Lehel, 40, is escorted by masked policemen in Bucharest, after being arrested in Arad, 550 km (337 miles) west of Bucharest, Jan.22, 2014. (Photo by Silviu Matei/Mediafax/Reuters)
Marcel Lazar Lehel, 40, is escorted by masked policemen in Bucharest, after being arrested in Arad, 550 km (337 miles) west of Bucharest, Jan.22, 2014. 

This story originally appeared on NBCNews.com.

For more of Cynthia McFadden's interview with Guccifer, watch Nightly News on Thursday and the new NBC series "On Assignment," which debuts Sunday at 7 p.m. ET/ 6 p.m. CT.