Should President Trump be worried about Joe Walsh's primary challenge?

Well no, not in the sense that he's going to lose to Walsh because he won't. Not even close. But it's certainly not helpful to have a former Trump-y conservative out there saying the president is totally unfit for office.

Will the House subpoena of Rob Porter mean anything?

I don't think it will change anything. I don't think the Democrats are closer to impeachment at this point. But Porter was potentially witness to alleged acts of obstruction of justice and it's good for Democrats to keep that story out there in the news.

Will the gun control talks go anywhere?

I don't think that they will. President Trump, as he has after previous attacks, is kind of all over the map on this, particularly on background checks. So I think the talks once again unfortunately fizzle out to nothing.

Final question: will the United States send nuclear bombs into hurricanes?

No, they won't. President Trump has denied he suggested this but I think the reporting is quite solid from Axios. But this is actually been looked at in the past and dismissed as a ridiculous and dangerous idea.