From Guns.com:

The legal challenge came from a Washington, D.C. couple — Andrew and Tracey Hanson — who tried to buy handguns from a federally licensed firearms dealer in Texas but could not due to federal law adopted in the 1960s. Together with FFL holder Frederic Mance, the couple joined with gun rights advocates of the Citizens Committee for the Right to Keep and Bear Arms in taking the government on, arguing that since the advent of federal background check systems the law makes little sense.