Joshua Steinman, an advisor to US President Donald Trump on cyber issues, adjusts his glasses prior the start of The Prague 5G Security Conference in Prague, Czech Republic, Thursday, May 2, 2019. (AP Photo/Petr David Josek)
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Joshua Steinman, an advisor to US President Donald Trump on cyber issues, adjusts his glasses prior the start of The Prague 5G Security Conference in Prague, Czech Republic, Thursday, May 2, 2019. (AP Photo/Petr David Josek)
