After the US invasion of Iraq, Muhammad-Taqi returned to Iraq from Iran. On his return to Iraq on April 22, 2003, Muhammad-Taqi was arrested along with his entourage by US military personnel. He was released after being brought to an undisclosed location. The Islamic Action Organization became a political party with al-Modaressi as its leader. The party contested the Iraq 2005 general election as was part of the National Iraqi Alliance of Shia Islamist parties. In 2006, the Islamic Action Organization had one minister in government, State Minister for Civil Society Affairs, Adil al-Asadi.