It’s Donald Trump vs. the World — and the fight is live on Twitter.

It began on Thursday, after Senator John McCain (R-AZ) denounced Trump for having “fired up the crazies.” Trump shot right back by calling for McCain’s defeat in his Senate seat next year — and also attacked the former Republican presidential nominee’s military record, as a student at the Naval Academy.

That one spurred condemnations from across the political spectrum — most notably from former congressman John Dingell (D-MI), a veteran of World War II.

Trump dug in Friday morning against the backlash, however, quoting a tweet from someone else in praise of his McCain trash talk.

Trump’s other big fight was with Rick Perry, who has already publicly taken on The Donald. On Thursday, Perry released a statement saying in part:

I have a message for my fellow Republicans and the independents who will be voting in the primary process: what Mr. Trump is offering is not conservatism, it is Trump-ism – a toxic mix of demagoguery and nonsense.

America doesn’t need another president who pays lip service when issues of national security are at stake. America doesn’t need another president who will pass the buck on border security. We need a president who will finally act to secure the border after decades of failed leadership in Washington, D.C. And Mr. Trump has done nothing to prove that he is the president America needs.

Cue the response by Trump, with a dig at Perry’s intelligence — an obvious sore point for the candidate who had the infamous “Oops” moment the last time he ran:

Well, that debate sure is going to be fun.

Photo: Gage Skidmore via Flickr.