Bishops argue that use of the Trident weapons would result in massive and indiscriminate loss of human life.

A recent suicide bombing killed 300 people and drove residents to turn to Shiite militias for protection.

"She saw a divided country. She fought violence with nonviolence. She worked to stop discrimination against immigrants."

"Dallas, I'm here to say we must reject such despair. I'm here to insist that we are not as divided as we seem," President Obama said.

Cardinal Nichols: "I look forward to working with you across a wide range of issues in service of the common good."

"If we are to sustain unity, if we are to get through these difficult times, if we are to honor these five outstanding officers who we have lost, then we need to act on the truths that we know," President Obama said at a memorial service for the officers.