China's legitimate security concerns for the Olympics should not become "a cover" to crack down on political dissent, US Secretary of State Condoleezza Rice said here Saturday. Rice told reporters during a visit to New Zealand that China "should showcase not just the Olympics but "an attitude of openness and tolerance," when asked about security threats in China and its handling of them. "Of course security threats have to be dealt with, but security should not become a cover to deal with dissent," Rice said at a press conference with Prime Minister Helen Clark.