Brian Ross, the chief investigative correspondent for ABC News, has been suspended for four weeks without pay after incorrectly reporting that Michael T. Flynn, the former national security adviser, would testify that President Trump had directed him to make contact with Russian officials while Mr. Trump was still a candidate, the network announced on Saturday.

Mr. Trump directed Mr. Flynn to make contact after the election, as president-elect, the network said.

ABC initially issued a clarification after Mr. Ross made the statement during a live broadcast on Friday but later called it a correction.

“We deeply regret and apologize for the serious error we made yesterday,” ABC said in a statement on Saturday. “The reporting conveyed by Brian Ross during the special report had not been fully vetted through our editorial standards process.”