The 18th Amendment to Pakistan's Constitution passed in 2010 removed the president's power to dissolve parliament unilaterally, transitioning Pakistan to a parliamentary republic. It also renamed North-West Frontier Province to Khyber Pakhtunkhwa and countered sweeping presidential powers accumulated under previous military leaders. The amendment bill passed both houses of parliament and was signed into law by President Zardari, marking the first time a Pakistani president willingly relinquished significant powers to parliament and the prime minister.