"In 2014, the United States issued a thorough review of our approach to overseas surveillance, President Obama issued a presidential directive that changed our approach in significant ways. We will work with our European allies and partners to address any questions through the appropriate national security channels," Jean-Pierre said.
On Sunday, a European media investigation revealed that the Danish Defence Intelligence Service cooperated with the US intelligence operations that targeted the highest-ranking European officials, including Merkel, from 2012 to 2014.
Earlier, French President Emmanuel Macron condemned such behaviour as unacceptable between allies.
