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CNN's Don Lemon talks to retired Col. Cedric Leighton on the possibility of the United States going to war with North Korea.

The Argentine military Tuesday released its most detailed timeline yet in this month's disappearance of a naval submarine, saying that the vessel first reported a battery short-circuit roughly 10 hours before an explosion-like sound was detected near the sub's last known location. Missing Argentine sub: New timeline released

The Argentine navy says it's not ready to give up a search for a vanished submarine, after the military revealed a sound consistent with an explosion was detected near the vessel's last known location last week off the country's South Atlantic coast. Navy not giving up search for sub after 'explosion' report

A noise detected near the last known location of a missing Argentine submarine on the day it vanished was consistent with an explosion, the Argentine Navy said. Critical moments in missing submarine search

Worried relatives of 44 missing Argentine submariners were comforted Tuesday by banners and the support of countrymen who gathered outside a naval base here. For now, all they can do is wait, hope and pray the crew will be rescued. Missing sub could be out of oxygen soon

Efforts to locate an Argentine submarine that has been missing since last week have been ramped up dramatically by a multinational search team of boats and planes, the country's navy says. Missing sub: What we know

Meghan Markle has been advocating for women's rights and making her mark in the philanthropy world long before her prince came along. CNN's Isa Soares reports.