From The Gun Mag:

The Milwaukee Journal-Sentinel first reported the congressman’s proposal which came months after that newspaper did a scathing expose of an ATF storefront sting operation in three states, including Wisconsin that used at least one developmentally disabled person.

Sensenbrenner’s office said the bill is still being crafted. He also suggested that ATF functions could be absorbed by other agencies such as the FBI and US Marshals or DEA.