Sen. Marco Rubio (R-Fla.). (Drew Angerer/Getty Images)

Marco Rubio might have chosen the wrong time to rejoin political Twitter.

In case you missed it, the senator from Florida is tweeting in his own voice again over at @marcorubio. In addition to run-of-the-mill legislative tweets, he’s been enjoying opportunities to troll journalists whose coverage is getting on his nerves (examples here, here and here).

So it’s no surprise Rubio chose to respond Friday to a scathing editorial criticizing his about-face on Donald Trump.

As a reminder, Rubio told CNN on Thursday he plans to help Trump get elected and would be “honored” to speak on his behalf at the Republican convention. The Washington Examiner’s Philip Klein — the author of the editorial — noted that this comes from someone who called Trump a “lunatic” during the primary, said he should not be allowed near the nuclear codes and predicted his political rise would result in anarchy.

“For all of Rubio’s rhetoric about responsible leadership, he’s now willing to embrace a demagogue just because that demagogue has an ‘R’ next to his name. Trump, for all his faults, has managed to expose Rubio’s true character — and it is not pretty,” Klein wrote.

Rubio took to Twitter to defend his change of heart on Trump, calling Klein a “keyboard cowboy” and saying his choice is all about defeating Hillary Clinton:

These messages got plenty of retweets from his supporters. But Rubio is now facing a backlash among political commentators, including many on the right, who called his justification hollow. We’ll see if Rubio responds any further.

Check out a sampling of those tweets — including responses to Klein’s editorial — below:

As a bonus, because it’s Friday, a reaction from comedian Rob Delaney: