He had begun this practice well before National Security Agency contract worker Edward Snowden leaked a trove of documents last year disclosing that the NSA was archiving the meta-data on telephone calls and emails and had secretly tapped into the main communications links that connect Yahoo and Google data centers around the world.
"I don't think there's any doubt now that the NSA or other agencies monitor or record almost every telephone call made in the United States, including cellphones, and I presume email as well," Carter told The Associated Press in an interview. "We've gone a long way down the road of violating Americans basic civil rights, as far as privacy is concerned."
The former president runs The Carter Center, which has pursued human rights, humanitarian work and offered political mediation and election monitoring since he left office in 1981.
Carter negotiated a nuclear disarmament pact with North Korea in 1994, which subsequently unraveled, and went to Pyongyang again in 2010 to secure the release of a US citizen who had been detained. He visited Syrian President Bashar Assad in 2008, and has been to Cuba, Vietnam and many other countries of interest to US intelligence. Carter Center monitors have observed disputed elections in Venezuela and many other nations.
Carter said the surveillance state is now so omniscient that he has turned to "snail mail" in an effort to avoid snooping.