WASHINGTON (AP) — Roger Stone, a longtime confidant of President Donald Trump, was sentenced to more than three years in prison Thursday for obstructing a congressional investigation in a case that has sparked fears about presidential interference in the justice system.

Soon after Judge Amy Berman Jackson pronounced sentence, Trump publicly decried Stone’s conviction as unfair and prominent Republican legislators were giving tacit support for a pardon. But Trump said he wasn’t ready to act just yet.

“I want the process to play out. I think that’s the best thing to do because I would love to see Roger exonerated,” he said. “I’m going to watch the process. I’m going to watch very closely. … At some point I’ll make a determination.”

The case was marked by the Justice Department’s extraordinary about-face on a sentencing recommendation and a very public dispute between Trump and Attorney General William Barr, who said the president was undermining the department’s historical independence and making “it impossible for me to do my job.”

The president responded by asserting that he was the “chief law enforcement officer of the federal government.”

Stone was convicted in November on all seven counts of an indictment that accused him of lying to Congress, tampering with a witness and obstructing the House investigation into whether the Trump campaign coordinated with Russia to tip the 2016 election.

He was the sixth Trump aide or adviser to be convicted on charges brought as part of special counsel Robert Mueller’s investigation into possible Russian interference in the 2016 election.

At sentencing Thursday, Jackson grilled federal prosecutor John Crabb on the department’s decision to replace a tough sentencing recommendation for Stone with a more lenient one, which had prompted the original prosecution team to quit the case. Trump had called the original recommendation of seven to nine years a “miscarriage of justice.”

Jackson pointedly told Crabb that he might know less about the case than anyone in the room.

Jackson said the evidence clearly showed that Stone testified falsely to Congress and repeatedly pressured a potential witness to either back up his lie or refuse to testify.