WASHINGTON, July 12 (Reuters) - Billionaire Elon 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.

The report did not indicate how much Musk donated but added

it was "a sizable amount" given to a group called America PAC.

Bloomberg reported that the PAC - a group that can receive

unlimited contributions for political activity - is next

required to disclose its list of donors on July 15.

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.

Musk, the world's richest person who runs electric car maker

Tesla, rocket maker SpaceX, social media company X and

other companies, did not respond to Reuters' request for

comments.

Biden campaign spokesman James Singer said that Musk knows

Trump is "a sucker who will sell America out, cutting his taxes

while raising taxes on the middle class by $2,500."

"Joe Biden has been standing up to people like Elon and

fighting for the middle class his entire career - and it's why

he'll win in November," Singer said in a statement.

Musk in recent years has more fully embraced the Republican

Party, which has weighed on the reputation and sales of Tesla,

the biggest source of his wealth.

Trump last month reiterated his pledge to immediately

abandon the Biden administration's "mandate" to support the

electric vehicle industry. But he added: "I'm a big fan of

electric cars. I'm a fan of Elon."

"He does an incredible job with Tesla."

Musk said they had "some conversations" and Trump is a "huge

fan of the Cybertrucks," referring to Tesla's electric pickup

trucks.

While he has publicly criticized Biden's policies on

immigration and electric vehicles and even his age, Musk has not

made any formal endorsement in November's contest and Trump has

said he did not know if he has Musk's support.

He has also endorsed antisemitic comments on X, though Musk

has denied being antisemitic.

Musk's views have hurt his standing among some consumers,

according to a CivicScience survey shown exclusively to Reuters.