U.S. House and Senate intelligence committees are reviewing the military campaign in Iraq, what the Pentagon knew and what it disclosed about weapons of mass destruction.
Sen. Trent Lott, a supporter of the President, said "after-action" reviews are not unusual and are a responsibility for Congress.
Intelligence agencies have already begun providing thousands of pages of material to the congressional panels. Some Democrats have questioned if the White House was forthright about its evidence of WMD.
"We need to get to the bottom of what was it that we knew? What was it that we didn't know? Were there, in fact, weapons of mass destruction there in the first place?" said Sen. Jack Rockefeller, a Democrat from West Virginia.
Lott contends the danger and potential for danger were sufficient to warrant action against Saddam Hussein, regardless of whether weapons of mass destruction were in Iraq's hands.
Also a concern for Congress is a new General Accounting Office report that contends 105 foreign nationals, suspected of terrorist involvement, were granted visas to enter the U.S. because of a lapse in the background check system.
The visas have since been revoked, but tension remains between the State Department, INS and FBI, which disputes the report.