What really jumped out at some people, though, was that Trump was proposing cuts to some relatively low-cost programs shortly before he prepared to fly to his Mar-a-Lago resort in Florida. According to an analysis from Politico, that’s a trip that costs about $3 million each time — and it’s a trip that he’s made four times this year.

If that $3 million estimate is true, he could have funded the U.S. Interagency Council on Homelessness — budgeted at $4 million in 2016 — for nearly four years if he’d just stayed in the White House.

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Others noted the cost of protecting first lady Melania Trump and the Trumps’ young son, Barron, at Trump Tower. Shortly after the election, a CNN Money report indicated that protecting Trump’s family in New York cost $1 million a day. If they instead joined him at the White House, of course, that cost would essentially be eliminated.

Combined, these costs could make Trump’s presidency awfully expensive, particularly in light of that proposed budget.

But that’s only if those estimates are correct.

We can start with the Trump Tower number. The million-dollars-a-day figure was sourced to three city officials, reflecting the city’s costs.

In February, the city of New York detailed precisely how much it had been spending to provide additional security at Trump’s home. Between the election and the inauguration, when Trump was living there as president-elect, the city spent about $308,000 a day. Once Trump moved to Washington, the city expects that the cost will be up to $145,000 a day when Trump isn’t visiting. (He hasn’t since being inaugurated.) That’s sharply lower than $1 million a day.

It’s also only the city’s costs. There are additional costs at the federal level, like Secret Service protection. In 2008, the former head of that agency estimated that protecting a candidate costs about $38,000 a day. Presumably protecting a spouse and young child would cost less. There were also reports about the Secret Service and the military seeking to rent space in Trump Tower to aid in supporting the president. It’s not clear whether that’s happened or how much space has been rented. (The Secret Service denied that it was planning to rent space.)

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CNN estimated that one of the floors of space reportedly under consideration could cost $1.5 million a year — or about $4,100 a day. If those numbers are all correct, and if the military rents that floor, the total for protecting Trump’s family in New York is a bit under $200,000 a day, including New York City’s costs.

Then there are those Mar-a-Lago trips.

Politico’s $3 million-plus estimate was based on an October 2016 Government Accountability Office report on a trip President Barack Obama took in 2013 — a report that The Post has also cited. That 2013 trip, which included a stop in Palm Beach, Fla., cost $3.6 million, $3.2 million of which was the cost of aircraft.

Air Force One costs $206,337 an hour to operate, and the D.C. to Palm Beach flight takes about two hours. That’s $824,000 right there, round-trip. So where did the other $2.8 million come in?

In part, it’s the cost of support aircraft. That 2013 trip included five other planes and four helicopters as part of Obama’s overall team, serving defense and short-distance transport roles. (The president goes to and from Andrews Air Force Base by helicopter, for example.) But that trip also included an unrelated trip to Illinois, meaning a much more complicated ballet of movement than Trump’s Mar-a-Lago trips would require.

Secret Service staffing on the 2013 trip ran about $180,000, according to the GAO. Most of the cost was eaten up by those support aircraft. The 89th Airlift Wing ran up a tab of $1.3 million, including the costs of operating Air Force One. Additional aircraft were used to “provide global passenger airlift, logistics, and aerial support and communications to the President,” which they would presumably also do for Trump’s trips down to Florida. But again, that trip included a flight to and from Chicago, which is slightly closer than Palm Beach from Washington.

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If we assume, just for the sake of an estimate, that the full cost of the 2013 trip can be allocated by hour of overall flight time — since the trips themselves were about the same length, one weekend, and since air support costs ate up most of the bill — we get an estimate of about $514,000 an hour. ($3.6 million divided by 3½ hours to and from Chicago and four hours to and from Palm Beach).

A five-hour trip to Palm Beach, then, would be about $2 million — $514,000 times four hours. This is a very loose estimate, mind you, but it seems more fair than $3.6 million.

These figures put Trump’s costs in a slightly different light. Sure, two trips to Mar-a-Lago still eats up the same amount as that year of funding for the Interagency Council on Homelessness, but at a slightly disproportionate level.

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If Melania and Barron never move to Washington and if Trump heads to Mar-a-Lago for four out of every nine weekends, our estimates put the total cost at something like $526 million over the course of Trump’s presidency. Melania Trump is apparently planning to join her husband in Washington at the end of the school year, though, and Trump calls Mar-a-Lago the “winter White House,” implying that he won’t be there in the summer. In which case the overall spending plummets further.

To only, say, $130 million or so. Only enough to fund the homelessness agency until 10-year-old Barron Trump is 42.