Attorneys for the man sentenced to federal death row for the racist slayings of nine members of a Black South Carolina congregation are set to formally argue that his conviction and death sentence should be overturned.

Oral arguments have been set for May 25 before the 4th U.S. Circuit Court of Appeals in the case of Dylann Roof, according to federal court records.

In 2017, Roof became the first person in the U.S. sentenced to death for a federal hate crime. Authorities have said Roof opened fire during the closing prayer of a 2015 Bible study session at Mother Emanuel AME Church in Charleston, raining down dozens of bullets on those assembled.

Serving as his own attorney in the sentencing phase of his trial, the self-avowed white supremacist neither fought for his life nor explained his actions, remorse, saying only that “anyone who hates anything in their mind has a good reason for it.”

Roof’s 2017 appeal to the 4th Circuit  came as no surprise, as transcripts of hearings to determine his trial competency revealed that Roof told his lawyers he’d seek appeals to drag his case out as long as he could. With the passage of time, Roof explained, he expected white supremacists to take over the U.S., pardon him for the killings and make him governor of South Carolina.

Following his federal death penalty trial, Roof was given nine consecutive life sentences after he pleaded guilty in 2017 to state murder charges, leaving him to await execution in a federal prison and sparing his victims and their families the burden of a second trial.

After that sentencing, Solicitor Scarlett Wilson ? who had also been pursuing the death penalty ? called the deal “an insurance policy for the federal conviction,” ensuring that Roof would spend the rest of his life in prison, should the federal sentence not stand.

Wilson also said that she felt more confident a federal death sentence would be carried out under the newly minted Trump administration that it would have been under a Democratic one. At the time, there was anticipation that then-President Donald Trump might swiftly resume federal executions, following cessation of the practice under several several previous administrations.

Trump’s decision to reinstate federal executions didn’t come until 2020, however, when his Justice Department ended a 17-year hiatus, going on to oversee a total of 13 federal executions. Due to his remaining appeals, Roof’s case was not eligible for execution at that time.