Out of 1,000 likely American voters, who participated in a recent independent public opinion survey, 53 percent said the still don’t trust NSA too keep surveillance legal.

While 34 percent favor the NSA’s tracking of the telephone calls and e-mails of millions of Americans as part of the effort to fight terrorism, but 49 percent are opposed and 17 percent are not sure.

Opposition is down from a high of 59 percent in early June when the NSA efforts were first disclosed in the media.

71 percent say it is at least somewhat likely that the NSA phone and surveillance programs have inappropriately violated the privacy of innocent Americans, with 41 percent who think it’s Very Likely, while 23 percent consider it unlikely that the NSA wrongly violated some Americans’ privacy, including 3 percent who say it’s Not At All Likely.

58 percent believe it is at least somewhat likely that continuing disclosure of the NSA phone and email surveillance programs is hurting U.S. national security, but 29 percent disagree, including 24 percent who think the continued disclosure is Very Likely to be hurting national security and 4 percent who say that is Not At All the case.

Belief that the programs have violated the privacy of some Americans and that their disclosure may be damaging to national security is essentially unchanged from early July.

Just 32 percent trust the president, the executive branch, Congress and federal judges to make sure the NSA abides by the Constitution, but 53 percent do not share that trust, and 15 percent are not sure.