President Donald Trump regularly promised that he would bring major changes to the federal government, including its law enforcement and intelligence agencies.

A sign of those changes came earlier this week when the man in charge of the FBI’s New York Field Office was forced to resign.

Assistant director says he "was not given a reason" for the move

According to ABC 7, Assistant Director James Dennehy revealed his departure in an email which was sent out to staff members on Monday.

"Late Friday, I was informed that I needed to put my retirement papers in today, which I just did. I was not given a reason for this decision," Dennehy explained.

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"Regardless, I apologize to all of you for not being able to fulfill my commitment to you to serve as ADIC NY for at least two years," he continued.

"But as I leave today, I have an immense feeling of pride - to have represented an office of professionals who will always do the right thing for the right reasons; who will always seek the truth while upholding the rule of law," the long-serving official declared.

Dennehy has been with the FBI for nearly a quarter century

Dennehy praised his staff for being people "who will always follow the facts no matter where they lead and be unapologetic about it."

He further hailed them for their refusal to "bend, break, falter, or quit on your integrity" along with their willingness to "always handle cases and evidence with an overabundance of caution and care for the innocent, the victims, and the process first."

The New York Post recalled how Dennehy first joined the FBI 23 years ago after serving in the Marine Corp and began working on counterintelligence cases in the New York Field Office.

He went on to serve as chief of staff to the executive assistant director of the National Security Branch at FBI headquarters in 2018, overseeing counterterrorism, counterintelligence, and weapons of mass destruction.

Dennehy has repeatedly clashed with the Trump administration

The Post pointed out that Dennehy has come into sharp conflict with the Trump administration over the past several weeks.

This included clashing with Deputy Attorney General Emil Bove in February over the dismissal of those who helped investigate the January 6 riot on Capitol Hill.

What's more, the FBI's New York Field Office was accused by Attorney General Pam Bondi of withholding "thousands of pages of documents" concerning late finance mogul and convicted sex offender Jeffrey Epstein.