Who was David Brinkley's co-anchor?

David Brinkley's co-anchor on "This Week," the Sunday morning news program, was Sam Donaldson. They worked together on the show from its inception in 1981 until Brinkley's retirement in 1996. Brinkley was well-known for his distinctive style and insightful commentary, while Donaldson provided a more confrontational approach to journalism. Their partnership became a hallmark of political reporting on television.