Each year, the President of the United States sends a proposal to the Congress for the maximum number of refugees to be admitted into the country for the upcoming fiscal year, as specified under section 207(e) (1)-(7) of the Immigration and Nationality Act. This number, known as the "refugee ceiling", is the target of annual lobbying by both refugee advocates seeking to raise it and anti-immigration groups seeking to lower it. However, once proposed, the ceiling is normally accepted without substantial Congressional debate and does not require Congressional approval. The administration should demonstrate that the ceiling is necessary as a "justified by humanitarian concern or otherwise in the national interest." The September 11, 2001 attacks resulted in a substantial disruption to the processing of resettlement claims with actual admissions falling to about 26,000 in fiscal year 2002. Claims were double-checked for any suspicious activity and procedures were put in place to detect any possible terrorist infiltration. Nonetheless, some advocates noted that, given the ease with which foreigners can otherwise legally enter the U.S., entry as a refugee is comparatively unlikely. The actual number of admitted refugees rose in subsequent years with refugee ceiling for 2006 at 70,000. Critics note these levels are still among the lowest in 30 years.