The First Amendment to the Constitution says government can't establish a religion, but neither can it limit the exercise of religion. And that's the issue here. What does it mean to be free to exercise your religion? It's not about what you can believe. It's whether you can act on those beliefs.

Many who later lost faith in Fidel Castro can remember how they once admired the man who needed just a dozen men to launch the Cuban revolution.

Fidel Castro was not interested in personal enrichment. His supporters say he deployed his enormous authority on behalf of health, education and welfare programs that brought Cuba attention around the world.

When ISIS last year called for the destruction of the Yazidi people, President Obama said that would constitute genocide and he ordered U.S. forces to keep it from happening. Human rights advocates say Christians now face a similar threat Nina Shea directs the Center for Religious Freedom at the Hudson Institute.

At one congressional hearing, Bishop Francis Kalabat complained that administration officials are overlooking what's happening to his fellow Chaldean Christians.

Trump has always talked about how important in dealing with foreign leaders, how important it is to establish a good personal relationship very close to what Pope Francis says, so they may both really want to emphasize their development of a personal relationship.

The letter writers span the spectrum from left to right. Members say they don't want this to become a partisan political issue. In fact, there are reasons administration officials have been cautious in making a genocide declaration.