There is a red button on United States President Donald Trump's desk, and it doesn't launch any missiles.

With a press, Mr Trump summons a butler who brings him a Coca-Cola.

This glimpse into how the 45th US president is making himself at home at the White House was mentioned briefly in an Associated Press interview published on Sunday (April 23).

"A man accustomed to wealth and its trappings, Trump has embraced life in the Executive Mansion, often regaling guests with trivia about the historic decor," White House correspondent Julie Pace wrote in "Trump at 100 days: 'It's a different kind of presidency'".

"With the push of a red button placed on the Resolute Desk that presidents have used for decades, a White House butler soon arrived with a Coke for the president."

While the AP interview was mostly about the first 100 days of Trump's presidency, this little detail, unsurprisingly, caught the attention of readers.

The number of tweets on the subject has soared since New York Times national security editor Amy Fiscus highlighted the lines on Twitter on Wednesday.

Trump's love for Coke, and for fast food in general, has been well documented. According to past reports, he also likes his steak well done, and with ketchup.

In January, a CNN reporter shared a photo of the billionaire with the soft drink on his desk.

During the campaign, he was frequently served Big Macs on his private plane. He has also shared a photo of himself eating KFC fried chicken on Twitter.

But according to Treasury Secretary Steven Mnuchin in an interview in March, Trump no longer dines on fast food because cuisine at the White House is "great".