ABC says Muir replacing Sawyer at ‘World News’

NEW YORK – ABC News is making a generational change at the top of its evening newscast, replacing Diane Sawyer with 40-year-old understudy David Muir in an attempt to take a run at longtime ratings leader Brian Williams at NBC’s “Nightly News.”

ABC also announced Wednesday that George Stephanopoulos will add the role of chief anchor for live news events and election nights to his current jobs as “Good Morning America” co-host.