Donald Trump’s new national security adviser will warn him not to engage in "appeasement" with Iran, and to become a "leader of the free world" in the manner of Ronald Reagan.
Robert O’Brien, previously America’s chief hostage negotiator, has compared the 2015 Iran nuclear deal to the 1938 Munich Agreement, which allowed Adolf Hitler to annex the Sudetenland.
In his book "While America Slept," described as a "wake up call for the American people," Mr O’Brien lambasted Barack Obama’s "lead-from-behind" foreign policy," which he said had made the world more dangerous.
He urged a "return to President Reagan’s ‘leader of the free world’ foreign policy and ‘peace through strength’ national security approach."
The 2016 book featured an endorsement on the cover from the hawkish Mr Bolton.
Mr Bolton departed abruptly last week after 17 months as national security adviser, following a series of disagreements with the president over North Korea, Iran, Afghanistan, Russia and Venezuela.
As special envoy for hostage affairs Mr O’Brien has worked on releasing US prisoners in Iran, and helped to secure the return of Danny Burch, an American hostage in Yemen.
He has worked closely with the families of US hostages, including in North Korea, and on justice reform in Afghanistan.
Earlier this year, Mr Trump sent him to Sweden to monitor the assault court case of American rapper A$AP Rocky, in which the president took a personal interest.
Mr Trump wrote on Twitter: "I have worked long & hard with Robert. He will do a great job!"
Mr O’Brien has given all the credit for hostage releases he worked on to Mr Trump.
He called the president "the greatest hostage negotiator that I know of in the history of the United States."
Mr O’Brien will become Mr Trump’s fourth national security adviser, and the most senior Mormon in the administration.
His hostage role had been overseen by Mike Pompeo, the US secretary of state, whose power within the administration is growing.
However, Mr O’Brien also has long links to Mr Bolton.
In 2005 President George W. Bush appointed him US Representative to the UN General Assembly. Mr Bolton was UN Ambassador to the UN at the time.
Mr Trump was said to have been attracted to Mr O’Brien’s personal style, which is a contrast to that of Mr Bolton, and to have concluded that he "looked the part" of national security adviser.
US officials indicated the president wanted an adviser who would be less of a public figure, and cause less controversy.
Mr O’Brien, a former lawyer from Los Angeles, was described by one US official as the "nicest guy on the planet," and someone who would not cause internal disruption at the Pentagon or state department.
Lindsey Graham, the Republican senator and friend of Mr Trump, said: "He [Mr O’Brien] understands the world for the dangerous place it is.
"He’s got great negotiating skills as our hostage negotiator. He’ll be a very sound policy adviser."
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