WASHINGTON, Aug. 18 (Xinhua) -- The United States will continue working with Pakistan in fighting terrorism, the White House said after President Pervez Musharraf announced his resignation Monday.

    "President (George W.) Bush is committed to a strong Pakistan that continues its efforts to strengthen democracy and fight terror," U.S. National Security Council spokesman Gordon Johndroe said in a statement.

    Bush "appreciates President Musharraf's efforts in the democratic transition of Pakistan as well as his commitment to fighting al-Qaeda and extremist groups," he said.

    Bush "looks forward to working with the government of Pakistan on the economic, political and security challenges they face," he added.

    Earlier, U.S. Secretary of State Condoleezza Rice said the Bush administration will keep working with the Pakistani government and political leaders.

    She also urged Pakistani authorities to "redouble their focus on Pakistan's future and its most urgent needs, including stemming the growth of extremism."

    Musharraf, who took power in 1999 in a military coup, announced that he would step down in a televised speech to the nation.

    Pakistan's ruling coalition parties said earlier this month that they would launch impeachment proceedings against Musharraf, a declaration that gave rise to mounting speculation about his possible resignation.

    Musharraf vowed to defend himself in the face of impeachment, but explained his decision to quit by saying: "For me, it is always Pakistan first."