"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.
However, Mueller's office filed a court document on Monday, saying Manafort breached the plea agreement by lying to both his office and the FBI on a "variety of subject matters," and called for sentencing to take place as soon as possible.
READ MORE: Assange's Lawyer Refutes Reports of Alleged Whistleblower-Manafort Meetings
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.