The cautious and considered HR McMaster is leaving the White House to be replaced by one of the most polarizing, irascible figures operating in contemporary national security circles: Former UN Ambassador John Bolton.
Bolton, who recently penned an op-ed in the Wall Street Journal arguing that a preemptive strike against North Korea would be both legal AND desirable, is widely believed to be one of the most interventionist figures to ever hold a senior position in the US government. Case in point: Before 9/11, Bolton helped found a group calling for the unilateral overthrow of Saddam Hussein. Rand Paul declared that Trump was wrong to trust someone who is "unhinged as far as believing in absolute and total intervention."
So it should hardly come as a surprise that Bolton plans to shake up the National Security Council staff when he arrives in the West Wing. Foreign Policy reports that Bolton, Trump's third NSA in 15 months, is preparing to begin firing staff and replacing them with his own allies, as well as a few allies of former NSA Michael Flynn, who share Bolton's hawkish views.