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MIAMI (CBSMiami/AP) —  Former Rep. Mike Rogers is stepping down from Donald Trump’s transition team.

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Rogers, a well-respected Republican voice on national security released a statement on the matter Tuesday saying he’s proud of the work his team did to produce policy and personnel guidance “on the complex national security challenges facing our great country.”

He says the work provides a “strong foundation” for Trump’s new transition team.

Days after winning the presidential election, Trump announced that he was putting Vice President-elect Mike Pence in charge of the transition. The move amounted to a demotion for New Jersey Gov. Chris Christie, who had been running the operations for months.

Rogers’ departure is likely to rattle some Republicans who worry about Trump’s lack of foreign policy experience. Rogers chaired the House Intelligence committee and is a former Army officer and FBI special agent.

Meantime, there is speculation on who is in the running for secretary of state under the Trump administration.

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Senate Foreign Relations Committee Chairman Bob Corker says he might be interested in being Donald Trump’s secretary of state.

But the Tennessee Republican told MSNBC on Tuesday that there are others who were more “central” to Trump’s presidential campaign and his victory that stunned the nation.

Corker said his camp has “had some conversations” with Trump officials. He adds that he’s glad they are taking their time over such an important appointment.

A Trump official has told The Associated Press that former New York City Mayor Rudy Giuliani has emerged as the favorite for secretary of state.

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