Trump's North Korea red line could come back to haunt him

By David Brunnstrom and Arshad Mohammed WASHINGTON (Reuters) - In three words of a tweet this week, U.S. President-elect Donald Trump vowed North Korea would never test an intercontinental ballistic missile. "It won't happen!" Trump wrote after North Korean leader Kim Jong Un said on Sunday his nuclear-capable country was close to testing an ICBM of a kind that could someday hit the United States. Preventing such a test is far easier said than done, and Trump gave no indication of how he might r