[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2008/POLITICS/07/09/fisa.explainer/art.cellphone.afp.gi.jpg caption="Mobile phones are one of the technologies that did not exist when the original FISA law was written."]
The Senate Wednesday passed controversial legislation meant to update the Foreign Intelligence Surveillance Act (FISA). The vote was 69-28.
The bill now moves to the president's desk. President Bush is expected to sign the bill.
The presumptive Democratic presidential nominee, Sen. Barack Obama, D-Illinois, voted for the update.
Obama had opposed the FISA reform legislation. A number of individuals have have criticized him for changing his position on the bill.
Sen. John McCain, the presumptive Republican presidential nominee, was not in the Senate Wednesday. He was campaigning in Portsmouth, Ohio, when the vote occurred.
Below, CNN's National Security Producer Pam Benson explains what is in the bill, why the bill is controversial, how the bill may affect Americans' civil liberties and why privacy advocates object to it.
Question: What is the purpose of FISA and why is it being changed?
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