Both the former IRS commissioner who was in charge when the agency singled out some conservative groups for extra scrutiny and the man who replaced him will be appearing at a Senate Finance Committee hearing Tuesday morning.

(We're following the news from Oklahoma, where a tornado devastated the Oklahoma City suburb of Moore on Monday. Most recent update: 6:45 a.m. ET.)

On a bright and warm Saturday morning, there's a steady flow of people dropping off donations at Martha's Table, a charity in downtown Washington, D.C. A mountain of plastic and paper bags stuffed with used dresses, scarves, skirts and footwear expands in one corner of the room. Volunteers sort and put clothes on hangers. They'll go on sale next door, the proceeds of which will help the needy in the area.

When the sun rises over the Rio Grande Valley, the cries of the urracas - black birds - perched on the tops of palm trees swell to a noisy, unavoidable cacophony. That is also the strategy, it could be said, that local officials, health care providers and frustrated Valley residents are trying to use to convince Governor Rick Perry and state Republican lawmakers to set aside their opposition and expand Medicaid, a key provision of the federal health law.

A monstrous tornado at least a half-mile wide roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods and destroying an elementary school with a direct blow as children and teachers huddled against winds up to 200 mph.

Tech giant Apple used a "complex web of offshore entities" to avoid paying billions of dollars in taxes in the U.S., a congressional investigation has found.

Damaging tornadoes ripped through Oklahoma on Sunday and Monday, causing widespread damage that is still being assessed, and additional severe weather is expected.

Our colleague Andy Carvin has scanned Twitter in search of reaction, including photos and video, from the massive tornado that swept through central Oklahoma on Monday.

It's another bad day for the Justice Department.

Trial of a lawsuit that seeks to stop yoga instruction in the Encinitas Union School District got underway today in a San Diego courtroom.

Although Oklahoma is a state where tornadoes are a fact of life, few days stand out like May 3, 1999.

Opponents of expanding background checks for gun sales often raise the fear that it would allow the government to create a national gun registry -- a database of gun transactions. In fact, federal law already bans the creation of such a registry. And the reality of how gun sales records are accessed turns out to be surprisingly low-tech.

Along with dozens of other Republican lawmakers, a local member of Congress is under fire from President Obama's non-profit over his global warming beliefs.

When movie stars become unbankable, they're no longer a slam dunk at the box office. When investments become unbankable, they're relegated to the Wall Street's junk pile. For ordinary Americans deemed unbankable -- those who don't have a traditional checking or savings account -- it can be hard to simply pay bills.

A state capitol that Thomas Jefferson designed to resemble a Roman temple, the home of Henry Ford’s first assembly line, the first indoor regional shopping mall, an airport with a swooping concrete roof that seems to float on air — these are among the buildings surveyed in this cross-country journey to 10 influential works of American architecture. Meet the daring architects who imagined them and learn the shocking, funny and even sad stories of how they came to be.

South Bay Union School District trustees have selected a Solana Beach administrator as the district's next superintendent.

The Internal Revenue Service is under fire for improperly singling out some conservative groups for extra scrutiny -- putting them through months (or longer) of questions that delayed or derailed the organizations' requests for tax-exempt status.

Maribel Ramos had served in the Army for eight years and was just weeks away from earning her degree at Cal State Fullerton when she went missing earlier this month. Her body was discovered late last week, and now her roommate has been arrested for her murder.

Public opinion on climate change may still be divided but a new survey finds climate experts agree on the cause. They point to humans as the problem behind global warming. That validates research done nearly a decade ago by a University of California, San Diego professor who says the science has always backed up the effects of climate change.

The San Diego-Tijuana region will soon have its first binational youth orchestra. Heightened border security and concerns about violence in Mexico can complicate such initiatives, but organizers say it’s worth the effort.