NEW YORK (AP) — ABC News' Jake Tapper is leaving to join CNN as its chief Washington correspondent and anchor of a one-hour weekday news program.

CNN spokeswoman Jennifer Scoggins said Thursday that Tapper's show would take an hour from the three-hour "Situation Room" newscast, which Wolf Blitzer currently hosts from 4 to 7 p.m. Eastern time on weekdays.

Tapper has been at ABC since 2003, most recently as its senior White House correspondent and author of the Political Punch blog.

ABC says Jonathan Karl will be its new chief White House correspondent.