WASHINGTON (AP) — With President Donald Trump making his seventh presidential trip this weekend to his Mar-a-Lago resort in Florida, government watchdogs and Democrats are once again seeing dollar signs: namely, $3 million.

That’s a widely used estimate of what each journey costs taxpayers. The figure comes from a government report on a trip President Barack Obama made to Palm Beach, Florida, but the report’s author tells The Associated Press that it’s a mistake to apply those findings to Trump’s travel.

A conservative group that closely monitors presidential expenses puts the tab for each Mar-a-Lago visit closer to $1 million.

Neither the Secret Service, which protects the president, nor the Department of Defense, which transports presidential vehicles from place to place, has provided a tally of any Mar-a-Lago trip, although a government office is working up estimates that will eventually become public.

So why does anyone care whether Trump is frequenting Florida, and how did $3 million become the common wisdom as the cost of each visit?

Trump himself drew attention to the issue when he called Obama a “habitual vacationer” who was costing taxpayers money. He repeatedly harangued Obama about it on Twitter between 2011 and last year.

The conservative group Judicial Watch estimated that Obama’s travel expenses totaled at least $96 million over eight years, based on partial responses to its freedom of information requests. In December, the group’s president, Tom Fitton, said Obama had engaged in “notorious abuse of presidential travel perks” and called on Trump to overhaul presidential travel.

But with seven Mar-a-Lago visits in less than three months, is Trump guilty of the same thing? Fitton says he doesn’t think so but added, “It’s not what we expected from him, given his criticism of Obama.”

“The best thing he can do is disclose the numbers and then make the case to taxpayers that it’s worth it for him to travel there,” Fitton said. “It’s a debatable point.”

Trump’s time at Mar-a-Lago appears to be a mix of business and pleasure.