Speaking in a statement, the White House said that Roger Stone had “already suffered greatly”.
The comment added: “He was treated very unfairly, as were many others in this case. Roger Stone is now a free man!”
Stone, 67, was scheduled to report by Tuesday to a federal prison in Jesup, Georgia, to begin serving a sentence of three years and four months for lying under oath to U.S. lawmakers investigating Russian interference in the 2016 US election.
The veteran Republican political operative’s friendship with Trump dates back decades.
Trump has been discussing with advisers the possibility of commuting Stone’s sentence, the source said.
Asked by reporters earlier on Friday about reports he planned to pardon Stone, Trump said: “I’ll be looking at it. I think Roger Stone was very unfairly treated, as were many people.”
A commutation does not erase a criminal conviction as a pardon does.
Late on Friday, the US Appeals Court for the District of Columbia denied Stone’s request for a delay in reporting to prison.
Trump’s decision to commute Stone’s sentence marks his most assertive intervention to protect an associate in a criminal case and the latest use of executive clemency to benefit an ally.
Congressional Democrats and other critics have accused Trump of undermining the rule of law by publicly complaining about criminal cases against associates including Stone, former White House national security adviser Michael Flynn and former campaign chairman Paul Manafort.
A Washington jury in November 2019 convicted Stone on all seven criminal counts of obstruction of a congressional investigation, five counts of making false statements to Congress and tampering with a witness.
Stone was convicted for lying to the House of Representatives Intelligence Committee about his attempts to contact WikiLeaks, the website that released damaging emails about Trump’s 2016 Democratic election rival Hillary Clinton that U.S. intelligence officials have concluded were stolen by Russian hackers.