WASHINGTON (AP) — Next week's presidential election isn't just a referendum on Donald Trump and Kamala Harris. It's also a measure of the influence the world's richest man wields over American democracy.

Elon Musk, the South African-born tech and business titan, has spent at least $119 million mobilizing Trump's supporters to back the Republican nominee. His social media platform, X, has become a firehose of pro-Trump propaganda. And he's playing a starring role in Trump-style rallies in critical battleground states.

All the while, he's coming under growing scrutiny. He skipped a hearing on Thursday in a lawsuit over his effort to dole out millions of dollars to registered voters, a giveaway legal experts liken to vote buying. He's being investigated by the Securities and Exchange Commission. And The Wall Street Journal recently reported that Musk regularly communicates with Russian President Vladimir Putin, a potential national security risk because SpaceX, his aerospace company, holds billions of dollars worth of contracts with NASA and the Department of Defense.

Musk is hardly the only person whose megawealth places him at the nexus of politics, business and foreign policy. But few are working so publicly for a single candidate as Musk, whose expansive business ties and growing bravado pose a vexing test of one unelected person's political power. His stature is perhaps one of the most tangible consequence of the Supreme Court's 2010 Citizens United decision, which eliminated many limits on political giving.

"This is definitely an election brought to you by Citizens United," said Daniel I. Weiner, the director of elections and government at the Brennan Center for Justice, who added that the phenomenon was bigger that just Musk. "What this is really about is a transformation of our campaign finance system to one in which the wealthiest donors are playing a central role."

Musk did not respond to a request for comment made through his attorney. Tesla, his electric car company, and X did not respond to inquiries. SpaceX disputed parts of The Journal's reporting in a statement and said it continues to work in "close partnership with the U.S. Government."

Musk's recent conversion to 'Dark MAGA'

Musk's conversion to a self-described "Dark MAGA" Trump warrior is a recent one. In the past, he donated modest sums to both Republicans and Democrats, including $5,000 to Hillary Clinton in 2016, records show. He didn't contribute to Trump's political efforts until this year, according to federal campaign finance disclosures.

He was all in once he did.

Musk is now leading America PAC, a super political action committee that is spearheading Trump's get-out-the-vote effort. As a newcomer to politics, there have been growing pains.

Over the summer, America PAC struggled to reach its voter contact goals. Musk brought in a new team of political consultants, Generra Peck and Phil Cox, who worked on Florida Gov. Ron DeSantis ' losing Republican presidential primary bid.

On paper, the numbers have improved. But Republican officials, operatives and activists say in some critical places it's been difficult to tell how active the PAC's ground effort has been.

The PAC's presence is not perceptible in rural Georgia, according to three Republican strategists who are closely monitoring the ground game in the battleground state. For example, America PAC has shown little evidence of leaving literature behind on doorsteps, as is common when a voter is not home, especially in remote places, the three people said.

There are also indicators Musk, a tech innovator, has been taken advantage of at his own game. In Nevada, three other people familiar with America PAC's efforts said hired canvassers paid tech-savvy operatives to digitally manipulate an app used to track their progress — appearing to falsify their data so they could get paid for work that they did not do. Canvassers are typically paid by the number of doors that they knock on.

There are signs the practice wasn't limited to Nevada. One person warned America PAC leadership weeks ago that canvasing data from multiple states showed signs that it had been falsified, but their concerns were not acted on, according to two people with knowledge of the matter.

The individuals, like others who provided details about Musk's political operation, insisted on anonymity to discuss the matter out of fear of retribution.

Musk has become frustrated with his PAC

Musk has become frustrated with the inner workings of his political organization and has brought in private sector associates, including Steve Davis, president of the Boring company, Musk's tunnel building company, according to three people with knowledge of the move. Davis' role with America PAC was first reported by The New York Times.

A person close to the PAC disputed that the group had been taken advantage of, suggesting it was a conspiracy theory based on a poor understanding of how political canvassing works. The person insisted on anonymity because they were not authorized to publicly discuss the innerworkings of the PAC.

Musk has more riding on the election than just bragging rights.

The National Highway Traffic Safety Administration, the main agency that regulates Tesla, has repeatedly proved to be a thorn for the electric car maker run by Musk, which is the primary source of his wealth. The agency is overseeing more than a dozen recalls, some that Tesla resisted. It has also opened investigations that have raised doubts about Musk's claims that Tesla is close to deploying self-driving vehicles, a key expectation of shareholders and a major driver of Tesla's lofty share price.

Earlier this year Tesla disclosed that the Department of Justice and the SEC have requested and subpoenaed information about "Full Self-Driving" capability, vehicle functionality, data privacy and other matters.

The social media platform X is another Musk company that has drawn interest of the Biden administration. The Federal Trade Commission has probed Musk's handling of sensitive consumer data after he took control of the company in 2022, but has not brought enforcement action. The SEC has an ongoing investigation of Musk's purchase of the social media company.

Many of these troubles, which Musk blames President Joe Biden and Democrats for, could go away if Trump is elected. The former president has mused that Musk could have a formal role in a future Trump administration that focuses on government efficiency — an enormous conflict of interest given Musk's companies vast dealings with the government.

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Beaumont reported from Des Moines, Iowa, and Krisher reported from Detroit. Associated Press writers Alan Suderman in Richmond, Virginia, Barbara Ortutay in San Francisco and Mike Catalini in Morrisville, Pennsylvania, contributed to this report.