Education Secretary Arne Duncan is leaving his post in December, Fox News confirmed Friday. 

Duncan has spent seven years in the Obama administration. President Obama has named Education Department official John King Jr. as acting secretary through the end of his term. 

In an email to his staff, Duncan said he's returning to Chicago to live with his family. He said he isn't sure what he will do next, but that he hopes his future will "continue to involve the work of expanding opportunity for children." 

Sidestepping a nomination fight in Congress, Obama has tapped John King Jr., a senior official at the Education Department, to run the department in an acting capacity for the remainder of his administration. Obama doesn't intend to nominate King or another candidate for education secretary before his presidency ends in early 2017, said a White House official, who wasn't authorized to comment by name and spoke on condition of anonymity. 

The unconventional approach will spare Obama a fight over a nominee in the Senate but is likely to draw resistance from Republicans in the Senate, which holds the power to confirm or reject nominees for Cabinet-level posts. 

"John comes to this role with a record of exceptional accomplishment as a lifelong educator -- a teacher, a school leader, and a leader of school systems," Duncan said in an email to department officials obtained by The Associated Press. 

Duncan is one of just a few remaining members of Obama's original cabinet. Agriculture Secretary Tom Vilsack and Office of Management and Budget director Shaun Donovan have also served in the Cabinet since the first term. Donovan, however, first served as secretary of Housing and Urban Development. 

Duncan came to Washington from Chicago, where he ran the city's public school system. As part of the Chicago cohort that followed Obama to Washington, Duncan is one of few Cabinet members who has a personal relationship with the president. A basketball player at Harvard University who played professionally in Australia, Duncan was once a regular in Obama's weekend basketball games. 

As secretary, Duncan prioritized K-12 education and made his first signature initiative the Race to the Top program, in which states competed for federal grants. The program became a flashpoint in the fight over federal involvement in education. Critics argued it encouraged states to adopt the Common Core, a controversial set of curriculum guidelines that become symbolic of federal overreach. 

Duncan showed little patience for criticism of the program and the standards. In 2014, he cast critics as "white suburban moms who -- all of a sudden -- their child isn't as brilliant as they thought they were and their school isn't quite as good as they thought they were, and that's pretty scary." Duncan later said he regretted the "clumsy phrasing." 

In his senior Education Department role with the peculiar title of delegated deputy secretary, King oversees preschool through high school education and manages the department's operations. He was previously state education commissioner in New York, running the state's public schools and universities. 

The Associated Press Contributed to this report.