Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
The trend of aviation troubles, with a plane missing in Africa today, and a crash in Taiwan yesterday.
2013 saw many complex and controversial legal battles – covering everything from race, to health care, to marriage.
One of the biggest cases for the U.S. government was brought on by Edward Snowden's leaks about the NSA snooping practices. A judge recently ruled there's a case to be made that some of the practices are unconstitutional, and President Obama says he will make a statement in January about reforms to the NSA.
Other controversial legal battles this year? the Supreme Court's decision on same sex marriage, a Utah judge striking down an anti-polygamy law, and the Greoge Zimmerman murder trial that gripped the nation.
Law professor Jonathan Turley, of George Washington University, discusses the biggest legal battles of 2013.