In 2002, congress agreed with president george w. bush that
american troops could invade iraq if necessary
the u. s. military should return from iraq
saddam hussein should remain the leader of iraq
the united states should establish a colony in iraq

The answer is: American troops could invade Iraq if necessary.
       
In October 2002, the United States Congress passed the Public Law Number 107-243, called "Authorization for Use of Military Force Against Iraq Resolution of 2002" This resolution cited the factor that could justify the use of military force against Iraq, being the most notable the possible development and storage of chemical and biological weapons as well as seeking a nuclear weapons capability.