He noted that he was "taken aback a bit" by the "hyperventilation" over Russia's alleged involvement in the hack.
Clapper was likely referring to the concern expressed in recent days among analysts and high-level officials that the hack was Russia's way of making the Democratic Party look bad in order to garner support for Donald Trump. The Republican presidential nominee has expressed views that largely align with Moscow's vision of the international order.
Earlier this week, former National Security Agency contractor Edward Snowden claimed on Twitter that the US intelligence community — specifically, the NSA — has the technical ability to draw a straight line from the hack on the DNC back to Russia.
He then argued that it should use those capabilities if assertions about the Kremlin's attempts to meddle in the domestic politics of a foreign adversary are to be taken seriously.