President Obama during his news conference Tuesday at the White House. Larry Downing /Reuters /Landov hide caption

itoggle caption Larry Downing /Reuters /Landov

President Obama is expected to nominate Gina McCarthy, currently assistant administrator with the Environmental Protection Agency, to head the agency on Monday. The nomination requires a Senate confirmation. Alex Brandon/AP hide caption

itoggle caption Alex Brandon/AP

New White House Chief of Staff Denis McDonough (left), at Friday's announcement. Behind the president: outgoing Chief of Staff Jacob "Jack" Lew, who has been nominated to be Treasury secretary. Jewel Samad /AFP/Getty Images hide caption

itoggle caption Jewel Samad /AFP/Getty Images

President Barack Obama and Vice President Joe Biden make a statement regarding the passage of the fiscal cliff bill in the Brady Press Briefing Room at the White House late Tuesday evening. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP

The Capitol is illuminated in Washington, where the House and Senate remain in session. The two chambers will miss a deadline to avoid the "fiscal cliff" tonight, as 2013 begins. Drew Angerer/Getty Images hide caption

itoggle caption Drew Angerer/Getty Images

Mormons line up outside the historic Salt Lake Temple for an annual conference in April 2010. George Frey/Getty Images hide caption

itoggle caption George Frey/Getty Images