Morning News: Former President Carter undergoes brain surgery. A brutal arctic blast slams the U.S.

A brutal arctic blast is slamming the U.S., and is expected to bring dangerously cold conditions to more than half of the country. We have breaking news overnight from Atlanta, where former President Jimmy Carter underwent brain surgery this morning. Israel says it killed a commander in the Palestinian group "Islamic Jihad" in a rare airstrike on a militant leader. A CBS News poll on impeachment, out this morning, shows Americans are still split ahead of tomorrow's first public hearings. The Supreme Court hears arguments today in case that could lead to the deportation of nearly 700,000 young immigrants known as "dreamers."