A man claiming to be the person who delivered a gift-wrapped package of horse manure at the Los Angeles home of US Treasury Secretary Steven Mnuchin said on Monday he did it to protest the federal tax overhaul signed into law last week by President Donald Trump.
Robert Strong, a 45-year-old psychologist for the Los Angeles County Mental Health Department, said by telephone he left the poop-filled parcel addressed to Mr Mnuchin and Mr Trump in the driveway outside the Treasury Secretary's home in the posh Bel Air community.
KNBC-TV, an NBC television affiliate in Los Angeles, reported Mr Mnuchin was not home at the time.
The package was found by Mr Mnuchin's neighbour.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
"Protest really should be funny," Dr Strong told Reuters.
"People's eyes glaze over when they just see angry people in the streets."
Dr Strong believes the new tax law will hurt poor people.
Neither the US Secret Service nor the Los Angeles Police Department, both of which investigated the incident, would confirm Dr Strong was responsible.
The Secret Service interviewed an individual who admitted delivering the package, but no charges had been filed against him as of Monday afternoon.
LAPD Lieutenant Rob Weise said it was possible whoever left the package did not break any criminal laws.
While he is not assigned to investigate the incident, Lt Weise said if the box did not present any danger, it would not be illegal. The LAPD bomb squad X-rayed the box before opening it on Saturday.
In a photo of the card Dr Strong posted on Twitter, he wrote "Misters Mnuchin & Trump, We're returning the 'gift' of the Christmas tax bill" and signed it "Warmest wishes, The American people".
Dr Strong said a Secret Service agent, accompanied by six police officers, showed up at his house to question him on Sunday night, and the agent chided him, asking, "Are you ashamed of your behaviour?"
The White House declined to comment on Monday and officials with the Treasury Department could not be reached.
