Treasury chief Gordon Brown, replacing Tony Blair as leader of Britain's Labour Party, vowed Sunday that the country's foreign policy will recognize that defeating terrorism "involves more than military force."

Brown, who will succeed Blair as prime minister on Wednesday, also pledged sweeping domestic reforms to tackle poverty and improve health care. The woman elected Sunday as his deputy, Harriet Harman, has called for the government to apologize for mistakes over the Iraq war.

"Our foreign policy in the years ahead will reflect the truth that to isolate and defeat terrorist extremism now involves more than military force," Brown told a conference of party members in Manchester, northern England. "It is also a struggle of ideas and ideals."

He said Britain would "learn lessons that need to be learned," but would continue to take "tough decisions to ensure the long term defense and security of our country."

Blair, addressing party members, said Brown would give his "best in the service of the country."

"I know his best is as good as it gets," Blair added.