Trump's Pentagon pick says U.S. needs to be ready to confront Russia

By Phil Stewart and Patricia Zengerle WASHINGTON (Reuters) - Donald Trump's pick to lead the Pentagon put Russia at the top of a list of threats to U.S. interests and told Congress on Thursday that America must be ready to confront it where necessary, even as he backed Trump's bid to engage with Moscow. Retired Marine General James Mattis said Russia, China and Islamist militants were presenting the biggest challenge to the U.S.-led world order since World War Two, and called for Congress to lif