From a report by the Migration Policy Institute. So rounding up children at the border has a greater fiscal priority than catching the ten most wanted.
"The US government spends more on its immigration enforcement agencies than on all of its principal criminal federal law enforcement agencies combined. In FY 2012, spending for CBP, ICE and US-Visit reached nearly $18 billion. This amount exceeds by nearly 24% total spending by the FBI, Drug Enforcement Agency (DEA), Secret Service, US Marshals Service, and Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) which stood at $14.4 billion in FY 2012."