The top officers of the U.S. Capitol Police intend to step down soon, but little is known about their motivation. Chief Kim C. Dine submitted a letter of resignation to the Capitol Police Board last week, and Assistant Chief Daniel B. Malloy is retiring effective April 30, according to Roll Call. It is unclear whether Dine’s resignation will be accepted.

Dine was hired as Chief in December 2012, while Malloy — a 30-year veteran of the Capitol Police force — was elevated to Assistant Chief in June 2013. They are seeking to leave amid turmoil within their ranks. Earlier this year, police commanders reportedly ordered lower-ranking officers to avoid making “low-value” stops, such as for traffic violations resulting from drunk driving, so that they could focus on preventing terrorism and better protect Congress.

The U.S. Capitol Police has issued a statement thanking Malloy for his hard work, loyalty, and dedication to the police force, but has not commented on Dine’s letter. Lieutenant Kimberly Schneider tells National Review that Dine responded to news of his letter of resignation in an email to Capitol Police employees. Dine’s email touts his commitment to the police force’s shared duty.

“I would like to assure you that as your Chief, you have my full support as we continue to work together as a team that is focused on ensuring our success as we fulfill our critical mission,” Dine wrote. “As your Chief, I am immensely appreciative of the work that you do on a daily basis. I have the highest level of confidence in all of our sworn and civilian personnel, and as your Chief, personally reaffirm my continued commitment to this Department.”