President Obama Friday said he is deeply frustrated by “hyper-partisan” attitudes that have left some Republicans more trusting of Moscow than Washington, calling such attitudes a greater danger to America’s national security than Russian hacking of U.S. elections. Obama reiterated his contention that “the Russians were responsible for hacking” the Democratic National Committee, starting in mid-2015, and that the U.S. will retaliate against Moscow for the meddling.