The Latest: Tusk Says Summit Is Make or Break for UK Demands

3:10 p.m.

European Union President Donald Tusk says Thursday's summit of the 28 EU leaders to decide on the reforms that British Prime Minister David Cameron is calling for will be one of the most important the bloc has seen.

With many core issues still outstanding going into the two-day summit, Tusk said hours ahead of the opening summit session: "One thing is clear to me though. This is a make or break summit, I have no doubts."

Tusk said that both sides were still "in the middle of still very difficult and sensitive negotiations," as the summit center not only started filling with leaders but also legal experts who would have to pour any decision into binding legal texts...................

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