U.S. Trade Rep. Ron Kirk has announced he'll leave his post in late February, the White House says.
In a statement, Obama called Kirk a "tremendous advocate" for the American worker.
"There's no question Ron delivered results for the American people and for our economy," Obama said. "From bringing home new trade agreements with Korea, Colombia and Panama and negotiating to open up new markets for American businesses, to cracking down on unfair trade practices around the world, he has been a tremendous advocate for the American worker. As a former mayor, Ron was relentless in making the case to the American public that a balanced, thoughtful trade policy can contribute to a stronger economic future for America. I appreciate his service and wish him the best of luck."