“Lots of luck on his trip to the moon,” Biden said of Musk during an extended weekend trip to his Delaware beach home.

Musk snarked back on Twitter with a link to a 2021 NASA press release about SpaceX winning a $2.89 billion contract to send the next American astronauts to the moon in preparation for an eventual trip to Mars, where Musk plans to establish a human colony.

“Thanks Mr President!” he added.

The war of words erupted against the backdrop of Musk’s new status as the No. 1 enemy of progressives, who are infuriated that he plans to buy Twitter and turn it into a platform for unregulated free speech, which proponents say would give conservative viewpoints a footing on the liberal-dominated social media site.

On April 15, Sen. Elizabeth Warren (D-Massachusetts) sarcastically wished Musk a “Happy Tax Day,” noting that he reportedly paid no federal income tax in 2018 — even though he said he’d pay a record $11 billion on his 2021 earnings.

Rep. Alexandria Ocasio-Cortez (D-NY) has also accused Musk of having “an ego problem” and last week told Bloomberg she wanted to ditch her Tesla Model 3 for an electric vehicle made by unionized workers.

Musk is an outspoken opponent of unions who recently tweeted that he planned to stop voting for Democrats “because they have become the party of division & hate, so I can no longer support them and will vote Republican.”

“Now, watch their dirty tricks campaign against me unfold,” he added.

On Friday, Reuters said it obtained emails showing that Musk told Tesla executives on Thursday to “pause all hiring worldwide.”

In a follow-up email to employees, Musk said that the company would reduce its salaried headcount by 10% because it’s “overstaffed in many areas” but that “hourly headcount will increase,” according to Reuters.

“Note, this does not apply to anyone actually building cars, battery packs or installing solar,” Musk reportedly said.

Tesla and its subsidiaries employed nearly 100,000 people last year, according to a Securities and Exchange Commission filing that didn’t break down the numbers of salaried and hourly workers.

Musk’s emails followed repeated warnings from him that the US faced the risk of a recession.

“Elon Musk has a uniquely informed insight into the global economy. We believe that a message from him would carry high credibility,” Morgan Stanley analyst Adam Jonas said in a report.

And while demand for Teslas and other electric vehicles has remained strong, analyst Frank Schwope of the German bank NordLB said, “It is always better to introduce austerity measures in good times than in bad times.”

“I see the statements as a forewarning and a precautionary measure,” Schwope added.

Other leading execs have also been warning about the possibility of an American recession amid inflation that last month surged to 8.5%, the highest it’s been in more than 40 years.

“That hurricane is right out there down the road coming our way,” JPMorgan Chase chairman and CEO Jamie Dimon said Wednesday.

Biden — who scored a dismal 40% approval rating in a Rasmussen Reports poll Friday — contrasted Musk’s corporate cutbacks with Ford’s Thursday announcement that it planned to add 6,200 factory jobs in Michigan, Missouri and Ohio to boost production of electric vehicles.

“While Elon Musk is talking about that, Ford is increasing their investment overwhelmingly,” he said.

Biden noted that the new hires would be “union employees, I might add.”

The president also touted the May jobs report released by the Labor Department on Friday, saying that the U.S. had made “the most robust recovery in modern history.”

“The job market is the strongest it’s been since just after World War II,” he claimed.

The monthly statistics showed the nation’s employers continued their hiring streak by adding 390,000 jobs, keeping the unemployment rate at 3.6%, just above a half-century low.

But while job growth remained steady, May’s number marked the lowest monthly gain in a year and stock market indexes fell on expectations that the Federal Reserve would continue raising interest rates in a bid to ease inflation.

The Fed’s moves have already caused mortgage rates to spike, pushing down home sales, and increased the cost of borrowing for businesses seeking to invest in new buildings and equipment in the wake of the COVID-19 pandemic.

Biden was pressed on the subject of inflation, a key factor in his pathetic poll numbers.

“There’s no denying prices, particularly around gasoline and food, are real problems,” he said.

“I understand that families who are struggling probably don’t care why prices rose. They just want to bring them down.”