JUDY WOODRUFF:

As we heard earlier, Donald Trump continued to suggest today that he might not accept the results of the November election if he doesn't win. But should he lose, could Trump legally challenge the results? And how would that process work?

To examine some of these questions, we are joined now by Chris Ashby. He's a Republican election lawyer. And Beverly Gage, she's professor of American history at Yale University.

And we welcome both of you to the program.

Beverly Gage, to you first.

Have we ever seen anything quite like this before?