Trump's tumultuous four years in the White House ended shortly after he was impeached on a charge of inciting his supporters' deadly January 6 attack on the U.S. Capitol, where lawmakers were gathering to certify Biden's victory in the November 3 election.
Trump has been keeping a relatively low profile since he moved to Palm Beach, Florida, and the upcoming CPAC address will mark his first major public appearance since leaving office on 20 January.
The source, who is familiar with the former President's speech, told CNN on Saturday that "he'll be talking about the future of the Republican Party and the conservative movement". Ten House Republicans voted with their Democratic colleagues to impeach him for inciting the mob that stormed the Capitol in a bid to block the formal certification of President Joe Biden's win.
On Wednesday, Trump called in to Fox News to offer his tribute to conservative talk radio host Rush Limbaugh, as well as insist that he won the November election.
Trump first appeared at CPAC in 2011 at the urging of GOProud, a gay conservative group. But the political landscape may have changed dramatically in four years and the Republican Party is going to spend much of that time fighting about what kind of party they want to be. "But the numbers are very good, they're very high".
A number of top Republicans who are considered possible candidates for the party's 2024 presidential nomination are also due to speak at CPAC, including Trump's secretary of state, Mike Pompeo, and Kristi Noem, the governor of South Dakota.
Lawmakers and attendees were forced to quarantine after last year's event following news that a person who had attended tested positive for COVID-19.
Ms Cheney is reportedly in Mr Trump's sights as he vowed to back the primary campaigns of Republicans ready to challenge incumbents who he regards as political foes. During a chat with Newsmax, Trump hinted whether or not he sees himself staying in politics.