The U.S. National Security Agencys surveillance programs are legal and under close scrutiny by other parts of the government, the agencys internal privacy watchdog said Monday in an online Q&A.

NSA surveillance and data collection programs conform to the U.S. Constitution, Rebecca Richards, the agencys first civil liberties and privacy director, wrote during an hour-plus Q&A on Tumblr.

The NSA operates under rules that ensure that its activities fall within the parameters of the Constitution, Richards wrote when asked why she believes the surveillance programs are constitutional.

The oversight regime governing NSA is extensive, spanning all three branches of government, she added. The fact that NSA created my job highlights the value and importance NSA leadership places on privacy and civil liberties protections.

Critics have said some NSA surveillance programs violate the Constitutions Fourth Amendment, prohibiting unreasonable searches and seizures by the government.

One Q&A participant asked if U.S. residents fears of being discreetly spied on are merited.

The fears are not merited, Richards wrote. NSA is a foreign intelligence agency, she wrote. Our mission is to collect critical intelligence on foreign powers or their agents necessary to defend the country.

U.S. law requires that the NSA, when targeting a U.S. citizen for foreign intelligence purposes, to obtain a court order based on a finding of probable cause to believe the intended target is a foreign power or an agent of a foreign power, she added.

One participant paraphrased Benjamin Franklin to Richards: He who gives up freedom for safety deserves neither. The questioner then asked whether the NSAs erosion of the Fourth Amendment is fair and righteous, in regard to the principles on which the United States were founded?

Richards again defended the NSA: Intelligence agencies, just like other government agencies, have a responsibility to protect privacy and civil liberties, she wrote. In the course of our operations, we take great care to protect and safeguard personal privacy.

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NSA privacy director defends agency's surveillance