Though many observers hat-tipped the Clinton campaign's snarky response, others noted that it may unintentionally evoke Clinton's decision while serving as secretary of state to delete thousands of emails on her private server that she deemed personal in nature.
Maybe not the best strategy for Hillary to tell people to delete things.
"I know how hard this job can be. That's why I know Hillary will be so good at it. I don't think anyone has been more qualified for this office," Obama said.
He added: "I want those of you who've been with me from the beginning of this incredible journey to know that I'm with her."
For the first time this election season, Obama is set to hit the campaign trail with Clinton in Wisconsin next week.
Ten facts you should know about Clinton:
Hillary Clinton 10 Facts
Hillary Clinton sets the internet on fire with a 3-word response to Donald Trump's tweet
1. She went by her maiden for years after she married Bill in 1975. She went by "Mrs. Bill Clinton" shortly after her husband lost the 1980 Arkansas gubernatorial election in part because voters had questioned their marriage's stability.
(Photo by Douglas Burrows/Liaison)
2. She once described herself as a tomboy who wanted to be an astronaut, and wrote to NASA as a 12-year-old about how she could become an astronaut. They sent her a reply, clarifying that NASA didn't accept women in their astronaut program.
(Photo by Karin Cooper, Getty)
3. She was the student speaker picked to give the commencement speech at Wellesley, and received a standing ovation.
(Photo by John Mottern, AFP/Getty Images)
6. In 1974, she was one of only three women out of 43 lawyers who worked on the inquiry into whether President Nixon would be impeached.
(Photo by David Hume Kennerly/Getty Images)
7. She named her daughter Chelsea after Joni Mitchell's song "Chelsea Morning."
(Photo by Daniel Berehulak/Getty Images)
9. She says she met Bill Clinton at the Yale law library when she approached him and said, "Look if you're going to keep staring at me, and I'm going to keep staring back, I think we should at least know each other. I'm Hillary Rodham. What's your name?"
(Photo by Mark Philips, AFP/Getty Images)
10. Her mother told her that she had been named after Sir Edmund Hillary, who was the first man to to climb Everest, despite the fact that he had done so five years after she was born. A spokesperson for Clinton has said that this was a "sweet family story her mother shared to inspire greatness in her daughter, to great results I might add."