State Department lawyers need to have the evidence to back up the charge before they make it. Here's Nebraska Republican Jeff Fortenberry questioning Assistant Secretary of State Anne Patterson at a House hearing.

The collapse of the Soviet bloc ended the massive subsidies that had kept the Cuban economy afloat. The once-vaunted education and health care systems fell into disrepair. Fidel Castro's stubbornness, meanwhile, made political and economic change difficult in Cuba.

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.

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.

Holocaust Museum said ISIS has carried out genocide against the Yazidis, but its investigation did not cover Christian persecution. Now there's concern the U.S. State Department might do the same, limiting any genocide pronouncement to Yazidis without mentioning Christians.

There's a culture war in this country. Americans in recent years, as you know, have become more secular. They don't go to church as often. Bible reading, prayers in public are now frowned upon. And, of course, in addition to that, a lot of people have become much more supportive of LGBT rights. And in reaction to that, biblically conservative Americans feel that their faith is under assault.

They don't want to feed an ISIS narrative that there is a religious war between Islam and the Christian West, plus genocide is carefully defined under international law.