WASHINGTON - The Department of Homeland Security wants to end the special immigration status that has allowed some 300,000 illegal Salvadoran, Honduran and Nicaraguan migrants to remain in this country, many of them in Florida, Bush administration officials say. But the final decision on the Temporary Protected Status for the three nations, which would force those migrants to return home or remain here illegally and risk deportation, still is under intense debate within the administration, the officials add.