JUNEAU, Alaska (AP) — A federal judge on Thursday upheld the Biden administration's approval of the massive Willow oil-drilling project on Alaska's remote North Slope, a decision that environmental groups swiftly vowed to fight.

U.S. District Court Judge Sharon Gleason rejected requests by a grassroots Iñupiat group and environmentalists to vacate the project approval, and she dismissed their claims against Willow, which is in the federally designated National Petroleum Reserve-Alaska. The administration's approval of Willow in March drew the ire of environmentalists who accused the president...