In rapid succession, the Senate Foreign Relations Committee convened its first Hearing on the Comprehensive Test Ban Treaty in seventeen years, and Senator Marco Rubio and 32 Republican colleagues made public a letter to President Barack Obama opposing the administration’s UN Security Council resolution and a companion P-5 statement reaffirming the CTBT. Senator Rubio & Co. threatened retaliation by denying U.S. funding for the Treaty Organization’s International Monitoring System. Then, Kim Jong Un weighed in with another nuclear test explosion.

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