Miller has reportedly started composing an initial draft of the speech with Trump's transition team, touching upon major themes such as border security, jobs and outsourcing, and the economy.
The speech will frame "Trump's first-term agenda in more nationalistic than ideological terms," Politico reporter Shane Goldmacher reported.
Miller, Trump's incoming senior White House adviser for policy, has been a major speechwriter throughout the campaign.
One of his most notable speeches was Trump's address at the Republican National Convention where the then-presidential candidate declared "I alone can fix it" when accepting the party nomination. Many critics, including BI's Josh Barro, deemed it "dark, depressing, and paranoid."
Trump is reportedly planning on adding his own imprint on the speech before it is finished.
The speech notwithstanding, the inauguration is shaping up to be an unusual one. Politico reported that Trump has floated skipping the traditional congressional luncheon to instead join the crowd in the Capitol after he is sworn in.
Trump's team wants to "reflect the fact that he would be the first citizen president," Christopher Ruddy, the CEO of Newsmax, told Politico.