President Obama blasted Republicans on Friday for disputing the legitimacy of CIA assessments about Russian interference in the election on Friday.

“Based on uniform intelligence assessments, the Russians were responsible for hacking the DNC, and that as a consequence, it is important for us to review all elements of that and to make sure that we are preventing that type of interference in the future,” Obama said at his year-end press conference at the White House. “That shouldn’t be the source of an argument.”