Barack Obama: “America's greatness doesn't come from building walls.”

I’m going to insist that we can do better than we’re doing right now.

And I will fight for that, even if I don’t always think it’s going to win.

The effort, he said, “should outrage all Americans, regardless of how they feel about Congresswoman Omar’s political views.”

It is a basic principle of American democracy that the government can’t selectively target individuals simply because of their political beliefs or what they say.