Back in 2000, when Donald Trump was considering a presidential run on the Reform Party ticket, he told Fortune, "It's very possible that I could be the first presidential candidate to run and make money on it." And though it's hard to say whether Trump has actually managed to turn a profit (at least not without getting a look at his tax returns), according to his re-election campaign's FEC filings, Donald Trump is sure as hell trying his best.

Even though Trump is, in fact, the current president, he only stopped running for a brief few hours on Inauguration Day. As soon as Trump filed for re-election, at 5:11 pm on January 20, his campaign officially sprang back into action. That means Trump can legally continue to funnel funds from donors back into his own businesses. According to the Trump campaign's self-reported FEC filings, this has amounted to about $600,000 spent at Trump-owned properties in just the first six months of his presidency.

Nearly $400,000 of that campaign money went to rent at Trump Tower, with $90,000 going to the The Trump Corporation for "legal consulting," nearly $60,000 to the Trump International Golf Club, $15,000 to the Trump International Hotel in DC, and about $1,700 to Trump-brand bottled water, among various payments. And that's just the money that went to businesses in which Trump has a personal role. The Trump campaign has spent a total of $10 million in the last six months; any shell companies and subsidiaries of other Trump-owned businesses that may have gotten a piece of that don't have to be disclosed.

What's more, this number doesn't include the more nebulous (and almost certainly larger) total spent on Trump's businesses simply by virtue of Trump being president. According to filings released last month by the Office of Government Ethics (whose director, Walter Shaub, quit earlier this month in protest of the executive branch's refusal to obey ethical norms) Trump's seen the income from his properties increase by tens of millions of dollars since he started campaigning. And the Trump family seems happy to do their part to help that along. After his election victory, Trump's Mar-a-Lago resort doubled its initiation fee to $200,000.

Not to mention the fact that any time either Trump or his family members stay at any Trump property (which they often do), the Secret Service is paying a Trump business for the privilege of accompanying them. For instance, The Washington Post reported that, of the $60 million in additional funding the Secret Service has requested for next year, $26.8 million would go toward protecting Trump's family in Trump Tower. And since the inauguration, the Secret Service has spent over $35,000 on Trump-owned golf cart rentals alone. Trump, of course, could easily choose to waive those fees if he so desired. As for the campaign front, the Republican National Committee held a $10 million re-election fund-raiser last month at the Trump International Hotel in DC—which, according to The New York Times, charged the RNC "regular prices" to use its facilities.

These sorts of expenses lining the president's own pocket is unprecedented. "No other president has presided over this many growing concerns," says Daniel Weiner, Senior Counsel for The Brennan Center at NYU's Democracy Program. "FDR and JFK were wealthy scions, but they didn’t really have anything to to do with the family business. Trump is unique—not only in his wealth and involvement with his business, but also in his clear personal preference to, whenever possible, stick to his own companies. He wants to live in his own buildings; he wants to do business there; and he wants to eat at his own restaurants."

The president's preference for keeping his campaign funds within the Trump universe whenever possible may lack precedent, but doing so doesn't necessarily violate any laws. The main potential issue at play is a legal concept called "personal use." Basically, when candidates raise campaign money, they can use it for any purpose related to getting themselves elected—or, if they're already a public official, they can use it for a number of official purposes. They can't, though, use the money for anything unrelated to the campaign or office. In Trump's case, that leaves a bit of a gray area.

"The argument is that funneling campaign funds to your business could also be considered personal use," said Weiner. "Except here’s the catch: If your business is selling or providing a bonafide service to your campaign, I don’t believe there is anything illegal about that. The question really is: Is the campaign paying a fair rate or a fair value for the service?" We've reached out the White House for comment, and will update if and when we hear back.