"It was never discussed, but I wouldn’t take it off the table. Why would I take it off the table?" Trump said in an interview with the New York Post.
Manafort reached a plea agreement with Special Counsel Robert Mueller in September after a jury found him guilty of eight charges of tax evasion and bank fraud.
Trump has repeatedly criticized Mueller's investigation into Russia's alleged meddling in the 2016 election and possible collusion with the Trump campaign, calling the probe a "witch hunt" and "hoax."
Russia has repeatedly denied allegations of meddling in the vote, arguing that no evidence has been provided to substantiate the claims.