BRUSSELS (AP) -- The Latest on negotiations on changes to EU law aimed at keeping Britain in the bloc (all times local):
European Council President Donald Tusk has unveiled proposals that he hopes will keep Britain in the 28-nation European Union.
The draft deal was made public on Tuesday in a letter to EU leaders. It must be endorsed by Britain's EU partners and is set to be thrashed out at a summit in Brussels on Feb. 18.
Tusk proposed that more power be given to national parliaments to potentially block legislation. The plan would not bind Britain to deeper EU integration, which is written into the EU's Lisbon Treaty.
It aims to balance the concerns of Britain about its membership terms and perceived loss of sovereignty to Brussels without requiring time-consuming changes to the EU's legal treaties.
Prime Minister David Cameron wants to hold a referendum by the end of next year on whether Britain should leave the EU, with this June already shaping up as a possible time for the vote.
A British official says the U.K. Parliament would have a role in blocking EU legislation that it disagrees with under draft rules for a new relationship between Britain and the European Union.
The plan is being negotiated in advance of a promised referendum on British membership that Prime Minister David Cameron has promised to hold by the end of 2017.
The details of the proposal have not yet been made public. European Council President Donald Tusk is expected to outline the terms later Tuesday.
The British official made the comments in a statement released only on condition of anonymity because the EU had not yet made its official announcement.
The official said that under the plan, if 55 percent of European parliaments disagree with EU legislation it could be blocked.