david muir diane sawyer getty abc world news David Muir taking over for Diane Sawyer as 'ABC World News' anchorABC has announced some changes in its news lineup Wednesday (June 25).

Diane Sawyer is leaving “ABC World News” to focus on primetime specials, tackling big issues and other reporting for the network. David Muir, who has been anchoring the weekend edition of “World News” for the past three years, will take over as the anchor on Sept. 2. He will also continue to co-host “20/20” with Elizabeth Vargas.

“We have an extraordinary team of anchors who are gifted storytellers and uniquely skilled broadcasters,” says James Goldston, president, ABC News. “For years to come, they will inspire us all to do our best work and set a high bar for excellence to inform, empower and inspire our viewers. For many years to come Diane will be a driving force at ABC News with her exceptional storytelling genius. She is one of the giants of modern journalism. Her curiosity, passion and energy are unmatched, and I can’t wait to see where she’ll lead us next.”

George Stephanopoulos is also taking on a new role at ABC. The “Good Morning America” anchor is stepping into the role of chief anchor for ABC News, which means he’ll handle breaking news, special reports and election night coverage, in addition to his jobs at “GMA” and hosting “This Week.”

Sawyer says of the move, “After wonderful years at ‘World News’ I decided it is time to move to a new full time role at ABC News. I’ll be joined by an incredible team of journalists dedicated to enterprise reporting, innovative approaches to breaking news and new ways of thinking about big issues and events around the world. I can’t wait to continue bringing more of my specials to prime time and appearing on all ABC News broadcasts, as well. And to my friends and colleagues George and David — congratulations. I look forward to exciting work together and great times ahead.”

A replacement for Muir on the weekend edition of “World News” has not yet been announced.

Posted by:Andrea Reiher

TV critic by way of law school, Andrea Reiher enjoys everything from highbrow drama to clever comedy to the best reality TV has to offer. Her TV heroes include CJ Cregg, Spencer Hastings, Diane Lockhart, Juliet O'Hara and Buffy Summers. TV words to live by: "I'm a slayer, ask me how."