ABOARD AIR FORCE ONE — President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE on Wednesday said he likes to carry cash in case he needs to leave a tip after he was shown in a photo with a $20 bill hanging out of his back pocket.

The president was asked about the photo, which was taken by Tom Brenner of Reuters, during a gaggle with reporters aboard Air Force One flying back to Washington, D.C., after a three-day trip out West.

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Trump confirmed he carries cash in his back pocket before pulling out a wad of bills to show reporters.

"I don’t carry a wallet because I haven’t had to use a credit card in a long time," Trump said with a smile. "I do like leaving tips to the hotel. I like to carry a little something. I like to give tips to the hotel. I’m telling you, maybe a president’s not supposed to do it, but I like to leave a tip for the hotel, etc., etc,."

Trump appeared amused by the photo, adding that he'd "like a piece of that picture."

Money is seen in the back pocket of @realDonaldTrump as he boards Air Force One in Mountain View, California. pic.twitter.com/fCavzFXJ8L — Tom Brenner (@tombrennerphoto) September 18, 2019

The president returned to Washington just after midnight on Thursday. He held a campaign rally in New Mexico on Monday night, then spent Tuesday and Wednesday in California, where he held fundraisers that brought in a total of $15 million.

Trump described the fundraisers as "very successful" on the trip back. He had events in the Bay Area, Los Angeles and San Diego and capped the visit to California with a stop at the border with Mexico.