Hillary Clinton went on the attack against rival Bernie Sanders in their most contentious presidential debate yet.
Presidential candidates prepare for their first electoral test on Monday.
Candidates clashed on gun control and healthcare on Sunday night in their liveliest television debate so far.
Presidential hopefuls talk national security in first debate since Paris and California attacks.
Republican front-runner and top challenger Ted Cruz ended a longstanding truce with bitter exchanges.
The 10 candidates in the evening's main debate were anxious to stand out, and several were quick to attack.
Democratic presidential candidate Hillary Clinton endured a testy 11-hour hearing in Congress.
Puts on hold federal regulations to curb carbon dioxide emissions mainly from coal-fired power plants.
Donald Trump, Bernie Sanders both hold leads over their competitors in final campaign blitz.
In first visit to a U.S. mosque as president, Barack Obama said such talk had "no place in our country."
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