What should be done about the caravan of people coming to the U.S.

[HairOfTheDog]

That needs to come via legislation from our government, which has failed to address the issue proactively for a decade. 

Republicans control Congress, what is stopping them from doing what they want?

The Republican Freedom Caucus isn't open to many of the immigration policies put forth in bi-partisan proposals, so McConnell won't put immigration reform to vote on the floor.

I do believe there are quite a few Republicans who want to make the necessary changes, but they're stymied by the extremists in their party.