Bulk data storage allows for the "potential of abuse", President Obama has said, as he announced plans to curb the National Security Agency's authority.
"While few doubt the legitimacy of spying on hostile states, individuals acting on their own is a new threat," Mr Obama said.
"These signals intelligence efforts have prevented multiple attacks and saved innocent lives, not just in the United States but around the globe. But the risk of government overreach has also become more pronounced".
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In other words, the Prime Minister will say that leaving the EU would not lead to a single EU law being abolished instantly.
Reclaim the Power stage a protest at Heathrow against a new runway or further airport expansion.
A colder night ahead as temperatures fall.