John Bolton, Donald Trump's former national security adviser, warns Ukraine against making too many concessions in the peace negotiations. And says that Trump is being manipulated by Putin.

Add Yahoo as a preferred source to see more of our stories on Google. Former national security adviser John Bolton warned Tuesday that Americans may not fully grasp the "harm" President Donald Trump's ...

(NewsNation) — As President Trump escalates his rhetoric about acquiring Greenland, his former security advisor John Bolton is ramping up his own arguments about why it’s a bad idea — possibly Trump’s ...

Longtime Republican thinking on national security, which embraces U.S. intervention abroad as well as military action, just collided with Trumpian thinking, which is dubious of both. Not surprisingly, ...

Former National Security Adviser John Bolton turned himself in to federal authorities in Maryland and pleaded not guilty after being indicted on charges of keeping top secret documents at his home and ...