July 13 (Reuters) - Elon Musk, the billionaire CEO of

Tesla, said he "fully endorsed" Donald Trump, calling the

Republican presidential candidate "tough."

Trump was safe, the U.S. Secret Service and his campaign

said on Saturday after multiple shots rang out at his rally in

Pennsylvania as video showed Trump grimacing and raising a hand

to his right ear.

"I fully endorse President Trump and hope for his rapid

recovery," Musk posted on his social media platform X.

Earlier, multiple shots rang out at Donald Trump's rally in

Pennsylvania on Saturday, with the Republican presidential

candidate grimacing and raising his right hand to his right ear

as shots rang out, video footage showed.

Musk later posted a photograph of Trump at the event,

followed by: "Last time America had a candidate this tough was

Theodore Roosevelt."

Representatives from social media company X, which Musk

runs, did not immediately respond to a request for comment.

Musk, who has been ramping up criticism of U.S. President

Joe Biden, has donated to a political group working to elect

rival presidential candidate Donald Trump, Bloomberg reported on

Friday, citing sources.

In March, Trump, a former U.S. president who is expected to

be formally nominated next week as the Republican Party's

candidate for the Nov. 5 election, met with Musk and other

wealthy donors.

In response to reports of the meeting, South Africa-born

Musk posted on X: "Just to be super clear, I am not donating

money to either candidate for US President." In May, he also

denied media reports that there had been talks over a potential

advisory role for him in any Trump presidency.