After an invasion by the United States and its allies in 2003, Saddam Hussein's Ba'ath Party was removed from power, and multi-party parliamentary elections were held in 2005. The US presence in Iraq ended in 2011, but the Iraqi insurgency continued and intensified as fighters from the Syrian civil war spilled into the country. On 9 December 2017, then-Iraqi Prime Minister Haider al-Abadi declared victory over ISIL and  announced full liberation of borders with Syria from Islamic State militants.