Mr Trump had already moved the convention’s public events out of North Carolina because of virus concerns.
But the spiking virus shifted south, too, and the planned gathering in Jacksonville increasingly appeared to be both a health and political risk.
Mr Trump and his advisers feared that going forward with big parties and “infomercial” programming in Florida would ultimately backfire on the president.
“It’s a different world, and it will be for a little while,” Mr Trump said, explaining his decision during at a White House briefings.
“To have a big convention is not the right time.”
A small subset of Republican delegates will still formally renominate Mr Trump on August 24 in Charlotte, North Carolina, at an event scheduled to last just four hours.
Mr Trump had decided last month to shift the ceremonial portions of the Republican convention to Florida because of a dispute with North Carolina’s Democratic leaders over holding an indoor gathering with throngs of supporters taking a pass on face masks.
But his plans for a grand gathering in Florida starting shrinking almost as quickly as the move was announced, as virus cases spiked in the state and other parts of the country.
Mr Trump said he plans to deliver an acceptance speech in an alternate form, potentially online.
Trump campaign manager Bill Stepien said the campaign will still “provide exciting, informative, and enthusiastic programming so Republicans can celebrate the re-nomination of President Trump and Vice President Pence.”
Mr Trump said thousands of his supporters and delegates wanted to attend the events in Florida, but “I just felt it was wrong” to gather them in a virus hot spot.
Some of them would have faced quarantine requirements when they returned to their home states from the convention.
“We didn’t want to take any chances,” he added. “We have to be vigilant. We have to be careful, and we have to set an example.”
President Trump is focused on leading the American people during this unprecedented crisis, and his number one priority in this decision was the safety of the people of Jacksonville, the convention attendees, and all of the American people.
— Ronna McDaniel (@GOPChairwoman) July 23, 2020
Democrats will hold an almost entirely virtual convention August 17-20 in Milwaukee using live broadcasts and online streaming, according to party officials.
Joe Biden plans to accept the presidential nomination in person, but it remains to be seen whether there will be a significant in-person audience.
The Biden campaign did not immediately respond to messages on Thursday seeking comment on Mr Trump’s announcement.
In recent weeks, Trump aides and allies have encouraged the president to consider calling off the convention, advising him it was not worth going forward with the event if the focus would be on the pandemic.
Mr Trump acknowledged that consideration, saying, “I could see the media saying, ‘Oh, this is very unsafe’.”
After a three-month hiatus, Mr Trump has stepped back to the forefront of the government’s handling of the virus with regular briefings aiming to stanch an erosion of support in public and private polls that has followed the surge in new virus cases.
Mr Trump said he did not cancel the event at the request of local officials, but the Jacksonville City Council was set to meet on Friday to discuss safety concerns around the convention.
Joint statement from Mayor Lenny Curry and Sheriff Mike Williams: pic.twitter.com/4E55XeOos3
— City of Jacksonville (COJ) (@CityofJax) July 23, 2020
Jacksonville mayor Lenny Curry, who is a former chair of the Florida Republican Party, said he appreciated Mr Trump “putting health and public safety first”.
“I know this was a difficult decision and just demonstrates and reaffirms once again his commitment to Jacksonville, the state of Florida and the people of the United States of America,” he said.
“I’m grateful for him and his leadership, and this was the right way to move forward.”
Joe Gruters, current chair of the Florida Republican Party and a state senator from Sarasota, called it a “selfless move that he cancelled.”
“Having our home-state candidate was going to be a really big deal for Florida, but listen, he had it right,” Mr Gruters said.
“At the end of the day, it’s about safety.”
More than 10,000 people were expected in Jacksonville — already a fraction of the number that would attend a normal convention.
Only 336 delegates will be allowed to participate in Charlotte under extraordinary procedures approved last month by the Republican National Committee. The balance of the more than 2,500 delegates will vote by proxy.
