Some critics deny the existence of a "special relationship" and call it a myth. Former US President Barack Obama considered German Chancellor Angela Merkel to be his "closest international partner" and said the UK would be at the "back of the queue" in any trade deal with the US if it left the European Union, and he accused British Prime Minister David Cameron of being "distracted by a range of other things" during the 2011 military intervention in Libya. During the 1956 Suez Crisis, US President Dwight Eisenhower threatened to revoke IMF loans because of Britain's invasion of Egypt to recapture the Suez Canal. In the 1960s, British Prime Minister Harold Wilson rebuffed US President Lyndon Johnson's request to employ British troops in the Vietnam War. British Prime Minister Margaret Thatcher also privately opposed the 1983 US invasion of Grenada, and US President Reagan unsuccessfully pressured against the 1982 Falklands War.