John Kerry actually said...

"Although the policy of the last administration was not to pursue U.S. ratification of the CTBT, that has not been the current administration's policy."

"We remain committed to securing the Senate's advice and consent on the U.S. ratification of the CTBT."

"This Administration considers U.S. ratification of the CTBT to be strongly in our national security interest."

"The United States is not proposing and will not support the adoption of a UN Security Council Resolution (UNSCR) imposing a legally binding prohibition on nuclear testing."