public function list_( $args, $assoc_args ) { // phpcs:ignore PSR2.Methods.MethodDeclaration.Underscore
		$group_id = $this->get_group_id_from_identifier( $args[0] );

		$roles = array( 'members' );
		if ( isset( $assoc_args['role'] ) ) {
			if ( is_string( $assoc_args['role'] ) ) {
				$roles = explode( ',', $assoc_args['role'] );
			} else {
				$roles = $assoc_args['role'];
			}
		}

		// Get our members.
		$members_query = groups_get_group_members(
			array(
				'group_id'            => $group_id,
				'exclude_admins_mods' => false,
				'group_role'          => $roles,
			)
		);

		$members = $members_query['members'];

		// Make 'role' human-readable.
		foreach ( $members as &$member ) {
			$role = 'member';
			if ( $member->is_mod ) {
				$role = 'mod';
			} elseif ( $member->is_admin ) {
				$role = 'admin';
			}

			$member->role = $role;
		}

		if ( empty( $members ) ) {
			WP_CLI::error( 'No group members found.' );
		}

		if ( empty( $assoc_args['fields'] ) ) {
			$assoc_args['fields'] = array(
				'user_id',
				'user_login',
				'fullname',
				'date_modified',
				'role',
			);
		}

		$this->get_formatter( $assoc_args )->display_items( $members );
	}