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EU Parliament chief Schulz wants clarity from British Prime Minister Cameron on reform demands

  • A member of protocol adjusts the British flag prior to a meeting of British Prime Minister David Cameron and European Commission President Jean-Claude Juncker at EU headquarters in Brussels on Thursday, Oct. 15, 2015. European Union heads of state meet Thursday to discuss, among other issues, the current migration crisis. (AP Photo/Virginia Mayo)

    A member of protocol adjusts the British flag prior to a meeting of British Prime Minister David Cameron and European Commission President Jean-Claude Juncker at EU headquarters in Brussels on Thursday, Oct. 15, 2015. European Union heads of state meet Thursday to discuss, among other issues, the current migration crisis. (AP Photo/Virginia Mayo)  (The Associated Press)

  • British Prime Minister David Cameron, left, is greeted by European Commission President Jean-Claude Juncker prior to a meeting at EU headquarters in Brussels on Thursday, Oct. 15, 2015. European Union heads of state meet Thursday to discuss, among other issues, the current migration crisis. (AP Photo/Virginia Mayo)

    British Prime Minister David Cameron, left, is greeted by European Commission President Jean-Claude Juncker prior to a meeting at EU headquarters in Brussels on Thursday, Oct. 15, 2015. European Union heads of state meet Thursday to discuss, among other issues, the current migration crisis. (AP Photo/Virginia Mayo)  (The Associated Press)

  • British Prime Minister David Cameron, second right, arrives for an EU summit at the EU Council building in Brussels on Thursday, Oct. 15, 2015. European Union heads of state meet Thursday to discuss, among other issues, the current migration crisis. (AP Photo/Francois Walschaerts)

    British Prime Minister David Cameron, second right, arrives for an EU summit at the EU Council building in Brussels on Thursday, Oct. 15, 2015. European Union heads of state meet Thursday to discuss, among other issues, the current migration crisis. (AP Photo/Francois Walschaerts)  (The Associated Press)

The head of the European Parliament is calling on British Prime Minister David Cameron to quickly clarify what proposals he has for the fundamental reform of the European Union to ensure Britain's continued membership of the bloc.

EU Parliament President Martin Schulz said Thursday ahead of a summit of EU leaders that "above all, we need clarity on what we will be discussing over the next few months."

Cameron is to have lunch with Jean-Claude Juncker, the head of the executive Commission, before discussing Britain's plans further on the sidelines of the summit.

EU nations are increasingly frustrated that Cameron hasn't made concrete proposals yet. Cameron plans to hold a national vote before the end of 2017 on whether Britain should leave the EU — a possibility known as Brexit.