WASHINGTON — The clamorous end to President Trump’s alliance with Elon Musk is increasing pressure on the White House over its signature legislation known as the “ One Big Beautiful Bill Act ” — a bill under intense scrutiny in the Senate that Musk wants killed over its price tag, but that Trump views as critical to the success of his presidency.

Their battle comes at a moment when Mr. Trump is engaged in a delicate dance on Capitol Hill to get his signature legislation, the so-called One Big Beautiful Bill, passed through Congress. At the same time, he is trying to negotiate the end to foreign conflicts that are proving much more intractable than he predicted.

U.S. President Donald Trump is not interested in talking with Elon Musk, a White House official said on Friday, signaling the president and his former ally might not resolve their feud over a sweeping tax-cut bill any time soon.