President Donald Trump on Monday blamed Rob Reiner’s outspoken opposition to the president for the actor-director’s killing, delivering the unsubstantiated claim in a shocking post that seemed intent on decrying his opponents even in the face of a tragedy.

Fox News host Greg Gutfeld on Monday stretched to defend President Donald Trump ’s kiss-off to slain director Rob Reiner, saying Trump’s words should be separated from his deeds.

Trump faced condemnation across the political spectrum Monday for appearing to mock the beloved director, 78, and his wife, 68, and saying their deaths were due to an “affliction” with “Trump Derangem...