Obama says in a speech prepared for delivery at the Justice Department Wednesday that intelligence officials have not intentionally abused the program to invade privacy.
But he also says he believes critics of the program have been right to argue that without proper safeguards, the collection could be used to obtain more information about American's private lives and open the door to more intrusive programs.
Obama announced the changes after a months-long review spurred by former National Security Agency analyst Edward Snowden's leaks about secret surveillance programs.
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