Does Prez Trump's statement to clemency advocates to "get this guy home" constitute an enforceable commutation?

The question in the title of this post is the question explored in this recent lengthy Washington Post article discussing a notable new filing by lawyers representing James Rosemond.  The article is headlined "Trump granted hip-hop manager clemency but left him in prison, lawyers claim," and here are excerpts (with links to key filings):

The waning days of Donald Trump’s presidency saw a carnival of celebrities and those with personal connections to him jostling for clemency. Trump obliged many of them, granting pardons to rappers Kodak Black and Lil Wayne and longtime allies Stephen K. Bannon and Roger Stone.

And then there was James Rosemond, known as “Jimmy Henchman,” a once-major player in the hip-hop industry who represented artists such as Salt-N-Pepa, the Game, Akon and Brandy before he was condemned to nine life terms for drug trafficking and murder for hire.

For years, Rosemond’s attorneys and a cadre of celebrity advocates — including retired National Football League great Jim Brown and the actor Michael K. Williams, who died last month — had argued that Rosemond was unjustly convicted, campaigning for President Barack Obama and then Trump to grant him clemency.  Late last year, it appeared to Rosemond’s advocates that they had succeeded. 

On Dec. 18, Trump called Brown and his wife, Monique, according to legal affidavits signed by the Browns. “Let’s get this guy home for Christmas,” Trump told the staff in his office during that call, the Browns said.

By the end of the conversation, the Browns said, they had no doubt that Trump meant he was commuting Rosemond’s sentence. Rosemond’s representatives say that they were told his family should go pick him up the following week and that loved ones traveled to West Virginia to be there when he walked out of prison after a decade inside.  But he never emerged, they say.  The family returned home devastated, and Trump left office two months later.

The Browns’ affidavits are now central to a novel legal argument being advanced by Rosemond’s attorneys that speaks to the mad dash at the end of the Trump administration, when celebrity and influence injected even more uncertainty than usual into the unsettled, high-stakes law of presidential clemency.

In a petition filed Thursday afternoon in federal court in West Virginia, Rosemond’s attorneys claim that Trump’s conversation with Jim and Monique Brown constituted a public communication that he was commuting Rosemond’s sentence, which they said is all that is required to make the decision binding and irreversible.

“Rosemond is serving a sentence that no longer exists,” his attorneys write.  Though the 20-page petition cites obscure examples of informal presidential clemency decrees dating to President Abraham Lincoln’s handling of Civil War deserters, Rosemond’s attorneys acknowledge in the document that “this exact situation is unprecedented — it does not appear to have happened in the history of the United States.”

In a statement to The Washington Post, Rosemond attorney Michael Rayfield said that despite the lack of precedent, “it’s clear to me that Jimmy doesn’t belong in prison for another day.”...

Scholars of presidential clemency interviewed by The Post were split on whether Rosemond’s legal argument has merit.

Mark Osler, a professor of law at the University of St. Thomas in Minnesota who has argued for changes to the presidential clemency process, said that the argument “presents a fascinating question that hasn’t been addressed in modern times.”

“They’ve got a good point, which is that the Constitution does not set out a method to the granting of clemency,” Osler said.  While in other cases, presidents, including Trump, signed pardon warrants, “there’s no statute or constitutional provision that requires that.”

Margaret Love, who served as U.S. pardon attorney from 1990 through 1997, said that the petition, as described to her by a reporter, touches on “really interesting” questions about the legitimacy of a pardon or commutation only uttered by a president.  “I believe there’s no reason in principle that a president should have to write something down,” Love said.

But she said she believed Trump’s language, as she gleaned from the Browns’ affidavits, did not amount to a clear declaration that he was commuting Rosemond’s sentence.  “While the president indicated an intention to do the grant, it does not sound to me like he actually did the grant,” Love said.