Mark Memmott

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.

Douglas Shulman, an appointee of President George W. Bush who left the IRS last November, and acting commissioner Steven Miller (who is losing his job because of the scandal) are due at the 10 a.m. ET hearing.

(We're following the news from Oklahoma, where a tornado devastated the Oklahoma City suburb of Moore on Monday. Most recent update: 8:40 p.m. ET.)

A day after a monster EF-5 tornado pummeled Moore, Okla., the focus turned to the victims.

NPR's Wade Goodwyn spent the day in the city talking to survivors. Christie Parrish decided to leave her home for her sister's shelter.

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.

Well, now the chairman and ranking Republican on the Senate Finance Committee have some questions and requests — actually dozens of them — for the IRS.

ABC News White House correspondent Jonathan Karl now says he regrets that some key parts of a major story he reported on May 10 were wrong.