Washington worries about "the possibility" that the act, which allows indefinite detention without trial, "might be used again to detain opposition political figures," said.
"The statement by a government figure that a leading member of the opposition had become 'a threat to the economy and national security' is extremely troubling," said McCormack, referring to warnings by Anwar Ibrahim, who on Thursday called for a no-confidence vote against Abdullah.against opposition leader
Last Friday Malaysian police arrested Teresa Kok of the opposition Democratic Action Party (DAP), Malaysia's top blogger Raja Petra Kamaruddin, and a reporter with a Chinese-language newspaper under the security law, citing security concerns.
"The United States firmly believes that national security laws, such as the ISA, must not be used to curtail or inhibit the exercise of universal democratic liberties or the peaceful expression of political views," McCormack said.
"The detention of opposition leaders under the ISA would be viewed by the United States and the international community as a fundamental infringement of democratic rights and values," he added.