Barack Obama defends Dmitry Medvedev microphone 'gaffe' Obama, who is attending a nuclear summit in Seoul, complained that the volatile political environment in the United States was not conducive to in-depth consideration of delicate issues like defence and arms control. "The only way I get this stuff done is if I'm consulting with the Pentagon, with Congress, if I've got bipartisan support," Obama told reporters. This is my last election. After my election I have more flexibility," Obama was heard to tell the Russian leader, who promised to transmit the US president's position to president-elect Vladimir Putin. Obama's most likely Republican challenger, Mitt Romney, immediately sought to make political capital out of the comments. "President Obama signalled that he's going to cave to Russia on missile defence, but the American people have a right to know where else he plans to be 'flexible' in a second term," said Romney, who was campaigning in California. In Washington, the White House explained it was committed to implementing a missile defence shield in Europe despite Russian objections, but that long-standing hurdles meant it would take time to conclude a deal. Washington and Nato argue that the shield is meant to protect Western nations against missile attacks from potential future nuclear powers such as Iran. Moscow fears the shield could undermine its own nuclear capabilities.