The United States has granted BP and Serica Energy a new license to run a North Sea gas field partly owned by Iran in a rare exemption by U.S. President Donald Trump’s administration as it prepares to renew sanctions on Tehran next month. The waiver extension will allow Serica to complete the acquisition of BP’s stake in the Rhum, Bruce and Keith fields, as well as buying Total’s stakes in Bruce and Keith, Serica said in a statement.