Two years ago this month, President Obama met with the families of Sept. 11 victims and other victims of terrorism at a special meeting in Washington, D.C., and promised “swift and certain justice” for the perpetrators. But the high expectations of that meeting have given way to frustration for many who met with Obama.

But with no timetable for a trial for those charged with being behind the attacks, Hamilton Peterson, who lost his father and stepmother on 9/11, says the families feel betrayed.

A White House spokesman declined to comment on the complaints of the victim’s families. But outside groups say that part of the problem for the administration has been the ongoing legal and political fight over the military prison at Guantanamo Bay. The president wants to close it, but a bipartisan coalition in Congress has adamantly refused to allow him to bring the inmates to facilities inside the U.S....