BEIJING (AP) — President Xi Jinping is poised to make a historic power grab as China's legislators gather from Monday to approve changes that will let him rule indefinitely and undo decades of efforts to prevent a return to crushing dictatorship.

This year's gathering of the ceremonial National People's Congress has been overshadowed by Xi's surprise move — announced just a week ago — to end constitutional two-term limits on the presidency. The changes would allow Xi, already China's most powerful leader in decades, to extend his rule over the world's second largest economy possibly for life....