When I try to get them to address that, it's a difficult argument to accept.

This is a difficult argument for the presidents to rebut.

That was a difficult argument to knock down.

And that is a very difficult argument to deal with, isn't it?

It may be that you have chosen a difficult argument to support or defend.

This is obviously a difficult argument to make, politically.

You have very difficult and emotional arguments on both sides of the fence.

But that's a difficult argument to make to players and owners who are haggling over revenue.

Then a rather difficult argument using generators and relations in the group G shows that the set is closed under taking inverses.

Nice to see a more balanced discussion of the difficult legal arguments today.