President Trump plans to unveil a new national security strategy on Monday presenting China and Russia as rivals seeking to realign global power in a potential threat to U.S. interests, Trump administration officials said Sunday. Trump's policy statement is expected to reflect the America First themes of his campaign, reversing Obama-era warnings about climate change and emphasizing the economic implications of U.S. foreign policy. "This strategy advances what I would call a principled realism," one official said. "In some ways, the global balance of power has shifted in unfavorable manners to American interests. This new strategy presents a plan of how America can regain momentum to reverse many of these trends."