FILE - In this Tuesday, May 17, 1960 file photo, President Charles de Gaulle of France, left, Premier Harold MacMillan of Britain, center, and U.S. President Dwight D. Eisenhower leave a summit at the Elysee Palace in Paris. De Gaulle twice vetoed Britain's application to join the then European Economic Community in the 1960s. On Wednesday, April 10, British Prime Minister Theresa May is to ask EU leaders in Brussels for an extension to Britain's departure from the European Union. French President Emmanuel Macron has been taking a hard-line ahead of the summit. (AP Photo, File)