The former president shocked officers at NYPD's 17th Precinct in East Midtown in Manhattan, New York City, Saturday afternoon where he posed for photos with a collection of cops and held a short question and answer session.
Trump said very little regarding America's gloomiest day when nearly 3,000 Americans were murdered in four coordinated attacks on the World Trade Center, the Pentagon, and a fourth plane that went down in Shanksville, Pennsylvania.
His visit to the precinct came after Biden was joined by former Presidents Bill Clinton and Barack Obama at the official 9/11 memorial ceremony at Ground Zero Saturday morning.
Former President George W. Bush, a Republican like Trump, attended the commemoration at Flight 93 memorial site in Shanksville where he talked to the family members of victims who perished when the United Airlines jet crashed killing all 40 crew and passengers on board.
Trump, who now lives at his Mar-a-Lago estate in Florida, is set to host a boxing match between Evander Holyfield and Vitor Belfort in Hollywood, Florida, Saturday night.
He told Fox News Friday he would be attending Ground Zero in New York City at some point Saturday.
He had been anticipated to make a trip around 1:30pm, local law enforcement officials told the New Jersey Globe, after being notified of the plans by the Secret Service.
His visit to the precinct occurred at about 1:40pm - around the time he had been touted to visit Ground Zero.
His spokeswoman Liz Harrington told the New York Times Saturday afternoon he was no longer planning to visit the site.
'He had the option to attend but decided to honor the day with different stops,' she said.