the multinational coalition in Operation Anaconda in January 2002. On April 18, 2002, an American pilot bombed Canadian forces involved in a training exercise, killing four and wounding eight Canadians. A joint American-Canadian inquiry determined the cause of the incident to be pilot error, in which the pilot interpreted ground fire as an attack; the pilot ignored orders that he felt were "second-guessing" his field tactical decision. Canadian forces assumed a six-month command rotation of the International Security Assistance Force in 2003; in 2005, Canadians assumed operational command of the multi-national Brigade in Kandahar, with 2,300 troops, and supervises the Provincial Reconstruction Team in Kandahar, where al-Qaida forces are most active. Relations between Canadian Prime Minister Jean Chrétien and Bush were strained throughout their overlapping times in office. After the September 11 attacks terror attacks, Jean Chrétien publicly mused that U.S. foreign policy might be part of the "root causes" of terrorism. Some Americans criticized his "smug moralism", and Chrétien's public refusal to support the 2003 Iraq war was met with negative responses in the United States, especially among conservatives. Prime Minister Chrétien said on October 10, 2002, that Canada would, in fact, be part of a military coalition to invade Iraq if it were sanctioned by the United Nations. However, when the United States and the United Kingdom subsequently withdrew their diplomatic efforts to gain that UN sanction, Jean Chrétien announced in Parliament on June 18, 2003, that Canada would not participate in the pending invasion. Nevertheless, he offered the US and its soldiers his moral support. However, according to classified U.S. documents released by WikiLeaks, a high-ranking Canadian official may have secretly promised to clandestinely support the invasion. Newly elected Canadian Prime Minister Stephen Harper and Bush were thought to share warm personal relations and also close ties between their administrations. Because Bush was so unpopular among liberals in Canada (particularly in the media), this was underplayed by the Harper government. Shortly after being congratulated by Bush for his victory in February 2006, Harper rebuked U.S. ambassador to Canada David Wilkins for criticizing the Conservatives' plans to assert Canada's sovereignty over the Arctic Ocean waters with military force. Central American Free Trade Agreement The U.S. Senate approved the CAFTA-DR on June 30, 2005, by a vote of 54–45, and the U.S. House of Representatives approved the pact on July 28, 2005, by a vote of 217–215, with two