"Even though I'm only 10, I'd like to show the nation what young people like me are ready for," Sanders read. "I admire your background in business, and I've started my own."
On Friday, the 6th-grader, now 11, got his wish: As Trump looked on, Giaccio donned safety goggles and gardening gloves - then took one item off the White House landscapers' to-do list.
"That's the real future of the country right there - we're lucky," the president said. "Maybe he'll be president someday."
Greg Giaccio, Frank's father, said his son wasn't immediately available to comment Friday because he was awaiting a tour of the White House. But after Frank started a lawn-mowing business, Giaccio said, it just made sense to reach out to high-profile customers.
"You have this image that [presidents] are intimately involved with everything," Giaccio said. "He started a business - obviously, Trump is in the news all the time. He said, 'Maybe I'll write him.'"
Giaccio, who works for the U.S. Office of Special Counsel - an agency with oversight over federal employees, not to be confused with Robert Mueller's investigation into possible Russian interference with the 2016 election - declined to say who he had supported in the 2016 election, citing the Hatch Act. But he said that Frank, the oldest of four children, began supporting Trump early in the Republican primary debates.
Frank isn't the only letter-writer in the family. "One of my younger kids wants to write NASA to get a trip to the moon," Giaccio said.
Frank had previously written to President Barack Obama, Giaccio added, but only got a form letter in response.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)