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When pressed, the button would alert a butler to fetch Trump a glass of his favourite fizzy drink whenever he wanted.
Trump confirmed its function in a 2018 interview with the Financial Times. After reporter Demetri Sevastopulo joked about whether the button could unleash a weapon, Trump said: "No no, everyone thinks it. Everyone does get a little nervous when I press that button." The reporter then said Trump then pressed the button to order some more Cokes.
Trump's diet coke button also made an appearance in 2017, when an Associated Press reporter went to the White House to interview the former president.
"Midway through my interview with President Donald Trump, he reached over and pressed a red button on his desk in the Oval Office. It didn't trigger a nuclear launch or send advisers scurrying into the room. Instead, a White House butler walked in with a single glass of Diet Coke on a silver tray for the commander in chief," Julie Pace wrote.
The news of Biden marking his territory, and ridding himself of the button, was first reported by Tom Newton Dunn, a commentator for Times Radio.
"President Biden has removed the Diet Coke button. When @ShippersUnbound and I interviewed Donald Trump in 2019, we became fascinated by what the little red button did. Eventually, Trump pressed it, and a butler swiftly brought in a Diet Coke on a silver platter. It's gone now," he wrote on Twitter.
During his time in office, Trump reportedly enjoyed up to 12 glasses of the drink a day, according to The New York Times.
Removing the outgoing President's Diet Coke button wasn't the only thing Joe Biden did following his inauguration on Wednesday. He signed 15 executive orders and two actions within hours, which reversed much of Donald Trump's legacy.
"Democracy has prevailed," he said as he took oath in the Oval Office, before telling the public at 17:15 local time (12:15am GMT) that there was no better time to "get to work" than right now.
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