He was expected to thank first responders to the horrific high school shooting and may come face-to-face with parents, survivors and others, some of whom have angrily called for firm action to prevent future assaults.
Trump tweeted that he will meet with people "whose lives have been totally shattered," but did not elaborate on his plans.
White House officials have not said when he would meet with those affected by the tragedy or whether he would travel to Marjory Stoneman Douglas High School in Parkland.
In Florida, parents and a number of students are demanding action in addition to customer offers of thoughts and prayers.
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More than 1,000 people attended a candlelight vigil Thursday night near the school, and at one point some began chanting, "No more gun! No more guns!" Lori Alhadeffs 14-year-old daughter Alyssa was killed and invoked the president's 11-year-old son, Barron, as she angrily called for help.
"President Trump, Barron goes to school. Lets protect Barron. And lets also protect all these other kids," she said on CNN, her voice raising to a shout.
In a departure from the original schedule, first lady Melania Trump arrived at Air Force One separately from her husband for the flight to Florida and boarded the plane while reporters were kept away. A spokeswoman said the change was due to scheduling.
Trump ignored shouted questions from journalists as he departed about a report in The New Yorker magazine that he had affair in 2006 with a Playboy model.
Trump, who frequently boasts about his support for the National Rifle Association, made no mention of gun violence or any new measure to restrict access to firearms during remarks Thursday about the shooting.
But his latest budget request would slash Medicaid, the major source of federal funding for treating mental health problems, and cut school safety programs by more than a third.
Last year, he signed a resolution blocking an Obama-era rule designed to keep guns out of the hands of certain mentally disabled people.
Police said the 19-year-old suspect in Florida, Nikolas Cruz, opened fire with an AR-15 rifle, killing 17 people and injuring 14 more.
The profile photo on Cruzs Instagram account showed a masked face wearing a "Make America Great Again" hat like those associated with Trumps campaign.
The shooting was the nations deadliest at a school since a gunman attacked an elementary school in Newtown, Connecticut, more than five years ago.
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