President Trump on Thursday called out a Washington Post columnist after she misspelled Michael Bloomberg’s last name “Bloombefg” while she was live-tweeting the Democratic presidential primary debate, suggesting she brush up on her spelling — quickly.

“(Jennifer Rubin), the wacko ‘conservative’ of the @washingtonpost, must learn how to spell the name Bloomberg before it is too late & he is gone!” Trump wrote on Twitter early Thursday.

He was responding to another tweet remarking on the typo and the former New York mayor’s disastrous performance at the Las Vegas debate.

Rubin, covering the debate, wrote about how Bloomberg was under attack on the stage by the other Democratic contenders.

“Bloombefg calm and not scrapping. smart to go high,” she wrote on Twitter.

The internet had a field day with the gaffe, and “Bloombefg” was trending on the site in New York by the morning.

“To be fair, Bloombefg was not the candidate who just had the worst debate performance in modern history, Bloomberg was,” tweeted Eldon Katz.

Rubin retweeted another posting Thursday morning as her response to Trump’s.

“Mr. Magoo attacks columnist for poor eyesight. But if @JRubinBlogger is being attacked by both Donald Trump and Bernie supporters, she’s doing it right,” Matt Bennett wrote.

Trump blasted Bloomberg’s debut debate performance Wednesday evening during a rally in Arizona at the same time as the Democrats were on stage.

“Now they have a new member of the crew, Mini Mike,” Trump said. “No boxes, we call him ‘No Boxes.’ And I hear he’s getting pounded tonight. You know he’s in a debate? I hear they’re pounding him.”

Thursday morning, Trump tweeted a link to an interview Bloomberg gave to Chris Wallace, the host of “Fox News Sunday,” in 2011 in which the mayor called the president “a New York icon.”

“This is the REAL Mini Mike. He admitted, many times, that he is ‘a fan of Donald Trump. He’s a New York ICON.’ Thank you Mike!,” Trump wrote.

Bloomberg, who is self-funding his campaign, appeared at the debate for the first time after he met the polling criteria to qualify.

He has spent more than $400 million on campaign ads since he entered the race in November, bypassing the first four contests in Iowa, New Hampshire, Nevada and South Carolina to concentrate on Super Tuesday, when 14 states go to the polls on March 3.