He dined with Rupert Murdoch and a handful of other billionaires, for Donald Trump.

He intends to appear at Madison Square Garden this weekend, for Donald Trump.

He is planning future speeches and possibly a campaign push in Wisconsin, for Donald Trump.

He is donating “substantial” amounts of money to a super PAC focused on Hispanic turnout, for Donald Trump.

With less than two weeks left before Election Day, Elon Musk, the world’s richest person, has grown only more frenzied in his efforts to help elect the former president. Mr. Musk has emerged as a central character of the campaign’s closing days, so much so that Gov. Tim Walz of Minnesota, Vice President Kamala Harris’s running mate, referred to him this week as Mr. Trump’s true “running mate.”

Mr. Musk, the leader of Space X, Tesla and X, has already poured $75 million into a pro-Trump super PAC called America PAC. But his efforts in recent weeks have become more labor intensive — and more expensive.

Tony Gonzales, the Republican congressman from Texas whose allied super PAC he said he expected would receive the “substantial” gift, has grown close with Mr. Musk since bringing him to tour the southern border last year. He described Mr. Musk as especially hands-on.

“He’s going all in — and you see that with the amount of resources that he and his team and the group has provided,” said Mr. Gonzales, who said he didn’t know the size of Mr. Musk’s check to the super PAC. “But I would argue it’s, more importantly, time. There’s nothing more valuable than a person’s time. And Elon is literally campaigning every day in Pennsylvania.”

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