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The White House is once again threatening to 'take action' if North Korea conducts nuclear missile tests

White House national security adviser Robert O'Brien warned North Korea that the U.S. would take action if the country moved forward with nuclear missile tests.

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Trump's new national security adviser dispatched to Turkey to halt assault on Syria

The Trump administration hopes to limit the fallout from the invasion, despite the Turkish President's insistence that there would be no ceasefire.

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Trump taps hostage negotiator Robert O’Brien as fourth national security adviser

President Donald Trump on Wednesday named U.S. hostage negotiator Robert O'Brien as his choice to replace John Bolton as his national security adviser, making him the fourth person to hold the post in the Trump administration