Trump carries a wad of cash for tipping people in his back pocket instead of a wallet

US President Donald Trump told reporters Wednesday that he carries cash in his back pocket instead of a wallet.

An eagle-eyed photographer snapped a shot of the president's pocket money as he was boarding Air Force One at Moffett Federal Airfield in Mountain View, California Tuesday.

In response to queries about the wad of cash, Trump said: “I don't carry a wallet because I haven't had to use a credit card in a long time.”

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US President Donald Trump on Wednesday told reporters that he doesn't carry a wallet because he hasn't “had to use a credit card in a long time” and instead keeps a wad of cash in his back pocket.

Washington-based photo journalist Tom Brenner caught a sneaky shot of Trump as he boarded Air Force One in California on Tuesday.

Wind blew Trump's suit jacket as he was climbing the stairs of the jet, revealing what appeared to be a stash of $20 bills in his back pocket.

Read more: Trump signed his $147-million replacement border wall with a Sharpie

At a press gaggle on Wednesday, curious reporters asked the president why he kept his cash in such a precarious place.

“Do you carry cash in your back pocket？” a reporter asked.

“I do! I do!” he responded, pulling out a “large wad of cash” from his back right pants pocket, according to Pool report

Trump explained that he hadn't used the cash “in a long time,” but likes to carry “a little something” for tipping hotel staff.

“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.”

He also said he prefers not to carry a wallet at all.

Trump was in California for a two-day trip to raise money for his 2020 reelection campaign.

He capped off the visit to the US-Mexico border wall and signed the $147 million replacement wall in Otay Mesa, California with a sharpie, calling it “amazing.”