Trump was subsequently ridiculed in the media and online as result of the gaffe - but now, almost one week later - he's offered an explanation on Twitter as to what was going on in that big orange head of his.
During a meeting at the White House, Trump referred to Apple CEO Tim Cook as "Tim Apple".
He accused the "fake news" media of spinning the story to make it look like he'd made a silly slip.
President Trump said he purposely condensed the name of Apple CEO Tim Cook as "Tim Apple" as a time-saving measure during a White House meeting and blamed the "Fake News" for making him look bad for it.
By changing his profile on Twitter, Tim Cook displays a sense of humor
Mr Trump said his apparent slip-up at a White House roundtable with business leaders last Wednesday (March 6) had been on goal. I mean, you've really put a big investment into the country.
Mr. Cook responded to the amusing side of the situation by changing his Twitter name to "Tim Apple" on March 7, with the Apple an emoji of his company's logo, ABC News reported.
"I used to say, 'Tim, you got to start doing it over here.' And you really have". Tim Cook will eat him for lunch. "I just thought, why would you lie about that", one said. "It doesn't even matter!" The president introduced defense company Lockheed Martin CEO Marillyn Hewson as "Marillyn Lockheed" at a conference past year.
On Monday morning, Trump said he combined Cook's and the company's name together because it was faster.