Senior White House staff knew of the ongoing investigation into the IRS's targeting of conservative groups ahead of the release of a report from a Treasury Department inspector general, White House press secretary Jay Carney said Monday, but held off on informing the president to wait for a final report. With the knowledge of an investigation, the White House held to a "cardinal rule" that it should not get involved in an external investigation, Carney said during his daily briefing. "No one in this building intervened in an ongoing independent investigation or did anything that could be seen as intervening,"...