I believe that this will hurt Trump's chances of re-election.

There is a faction of Americans - on both the left and right - who tolerated/kind of liked Trump because they believed that he was anti-war. Lefties who believed that Hillary was a bigger hawk, conservatives who care only about the stock market, etc. There are millions of these people, and they vote, and they're suddenly very upset with Trump.

The Republican politicians, white evangelicals, and racist right-wingers will trot out the party line in the days and weeks to come. Trump has their full support and nothing will budge them. However, Trump just lost support among a group of people who now have a very good reason to vote against him, even if they don't particularly like the Democratic candidate.

This was a stupid move on many, many levels. None of us know what this will lead to or what the consequences will be for our nation. I'm certain, though, that one consequence is fewer people supporting/tolerating Trump.