North Korea’s state media on Friday stepped up a personal attack on former U.S. Vice President Joe Biden for slandering its leader, calling the Democratic presidential candidate “a rabid dog” that needed to be put down. The official KCNA news agency did not say how Biden had insulted the North’s leader, Kim Jong Un, but the 2020 presidential hopeful has been critical of U.S. President Donald Trump’s policy, saying he was coddling a murderous dictator.