A Los Angeles psychologist has "outed" himself as the man behind the Christmas gift for Steven Mnuchin, the treasury secretary - a pile of manure.

President Donald Trump has described his tax cuts as a Christmas present for the American people.

In response, Robby Stone ordered a gift-wrapped bag of manure to be delivered to Mr Mnuchin's Bel Air mansion on Saturday night.

The treasury secretary called the police on finding the parcel, who discovered that it in fact contained a stinking "present" from an anonymous donor.

The present was accompanied by a note, which read: “Mrs.Mnuchin & Trump, We’re returning the ‘gift’ of the Christmas tax bill.

"It’s bulls--t. Warmest wishes, the American People.”

At the bottom of the card, he added: “PS — Kiss Donald for me."

Mr Strong came forward to claim the "gift" on Christmas Eve, posting on Facebook a cheeky photo of himself posing with a present that appeared to resemble the one Los Angeles police examined on Saturday night.

“Who coulda done such a thing,” he wrote.

Mr Strong told the Alabama paper AL.com that he procured the manure from a friend with horses, and left two separate boxes at both of Mr Mnuchin’s properties, including another mansion in Beverly Hills.