WASHINGTON – The Obama administration spent more money on immigration enforcement in the last fiscal year than all other federal law enforcement agencies combined, according to a report on the government's enforcement efforts from a Washington think tank.

The report on Monday from the Migration Policy Institute, a non-partisan group focused on global immigration issues, said in the 2012 budget year that ended in September the government spent about $18 billion on immigration enforcement programs run by Immigration and Customs Enforcement, the US-Visit program, and Customs and Border Protection, which includes the Border Patrol. Immigration enforcement topped the combined budgets of the FBI; Bureau of Alcohol, Tobacco, Firearms and Explosives; Drug Enforcement Administration and U.S. Secret Service by about $3.6 billion dollars, the report's authors said.

Since then-President Ronald Reagan signed the Immigration Reform and Control Act in 1986 – which legalized more than 3 million illegal immigrants and overhauled immigration laws – the government has spent more than $187 billion on immigration enforcement. According to the report, "Immigration Enforcement in the United States: The Rise of a Formidable Machinery," federal immigration-related criminal prosecutions also outnumber cases generated by the Justice Department.