![John Bolton](https://static-ssl.businessinsider.com/image/5ab43a2eb028471f008b4a42-1500/john bolton.jpg)
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Former U.S. Ambassador to the United Nations John Bolton speaks during CPAC 2018 February 22, 2018 in National Harbor, Maryland.
- The newly named national security adviser, John Bolton, reportedly promised President Donald Trump said he "wouldn't start any wars" if Trump gave him the job.
- Bolton is set to replace H.R. McMaster, who said on Thursday night that he is resigning from the Trump administration.
- Some political observers have criticized Bolton's appointment because of his past comments on diplomatic matters like unrest on the Korean Peninsula.
Newly named $4 promised President Donald Trump "he wouldn't start any wars" if got the position, $4.
Bolton replaces national security adviser Army Lt. Gen. H.R. McMaster, who held the post for over a year. Trump announced the change in a tweet Thursday evening.
A former ambassador to the UN under President George W. Bush, Bolton is known for his hawkish positions on $4 and Iraq.
Richard Painter, the former chief White House ethics lawyer under Bush, $4 that Bolton "was by far the most dangerous man we had in the entire eight years of the Bush Administration."