Mr Trump, who left the White House on 20 January, is set to speak at the Conservative Political Action Conference in Florida.
Donald Trump is expected next Sunday to make his first public appearance since leaving office.
The former US president, who departed the White House on 20 January, is set to speak at the Conservative Political Action Conference (CPAC) in Orlando, Florida.
The full line-up of the annual gathering of conservative politicians and media figures has not yet been announced.
But Mr Trump is expected to be the last speaker on the final day of the event of 28 February, NBC News reported, citing two sources familiar with the plans.