The New York Post, who was first to report on Saturday of Trump's plans, wrote that the former president will speak on Sunday, Feb. 28, the final day of the conference.
Trump has mostly remained quiet since leaving office, outside of putting out a few official statements, including one that attacked Senate Minority Leader Mitch McConnell for saying Trump bears responsibility for the Capitol Insurrection on January 6. Trump will also take aim at President Joe Biden, the source told NBC News, with an emphasis on attacking Biden's "disastrous" amnesty and border policies.
Trump has a long history with CPAC, which played a key role in his emergence as a political force.
After leaving office on January 20, Trump retreated to his Florida resort where, without a Twitter account, he has kept a relatively low profile even throughout his second impeachment trial. "In the months ahead I have much to share with you, and I look forward to continuing our incredible journey together to achieve American greatness for all of our people".
Trump has expressed anger at the 17 Republicans in the House of Representatives and Senate who voted to impeach or convict him, and on Tuesday he aimed his rhetorical fire at Senate Minority Leader Mitch McConnell, the nation's most senior elected Republican. "But the numbers are very good, they're very high", he said.
Trump called McConnell "a dour, sullen, and unsmiling political hack" and warned that if Republican senators stayed with him "they will not win again".
Other notable speakers at the conference include Trump's former Secretary of State Mike Pompeo, Trump's former Secretary of Housing and Urban Development Ben Carson, Florida Gov. Ron DeSantis (R), Trump's former press secretary Sarah Sanders, and South Dakota Gov. Kristi Noem (R).
Mr Biden, who is trying to steer the United States through the COVID-19 pandemic and an economic crisis, has tried to avoid discussing Mr Trump, at one point calling him "the former guy".