Mark L. Wolf, 78, senior judge of the U.S. District Court for the District of Massachusetts, resigned Friday from federal judicial service.

Wolf’s resignation is in protest against President Donald Trump, which he elaborated on in his op-ed published in The Atlantic on Sunday, “Why I am Resigning.”

“I no longer can bear to be restrained by what judges can say publicly or do outside the courtroom,” Wolf wrote. “President Donald Trump is using the law for partisan purposes, targeting his adversaries while sparing his friends and donors from investigation, prosecution, and possible punishment.”

Wolf went on to say that “the White House’s assault on the rule of law is so deeply disturbing to me that I feel compelled to speak out.”

Wolf was appointed to the Federal District Court for Massachusetts in 1985 by President Ronald Reagan. He served as chief judge from 2006 to 2012. In 2013, assumed senior status, which allows judges on the federal court to take on a lower case load while retaining full benefits granted their age and years of service total at least 80.

Wolf noted that his resignation does not allow Trump to fill his seat with his own nominee, as his seat was filled in 2013 after he was granted senior status and former president Barack Obama nominated Judge Indira Talwani to replace him.

The op-ed came two days after the court announced in a statement that he was leaving his position as senior judge.

“Judge Wolf has served on this Court with distinction for over four decades,” Chief Judge Denise J. Casper said in the statement. “His steadfast commitment to the rule of law, determination in wrestling with novel issues of fact and law, and dedication to making fair, equitable and legally sound decisions without fear or favor are the hallmarks of his time on the bench.”

During his tenure, Wolf also served served as a member of the Judicial Conference of the United States and chair of the Committee of District Judges on the Judicial Conference, and on the Judicial Conference Committees on Criminal Law, the Federal Rules of Criminal Procedure, and Codes of Conduct, according to the Federal District Court for Massachusetts.

In 2016, Wolf co-founded Integrity Initiatives International which is dedicated to “strengthening the enforcement of criminal laws in order to punish and deter leaders who are corrupt and regularly violate human rights,” according to their official website.