Donald Trump has been nominated for the Nobel Peace Prize. According to the guidelines, the person who has nominated him cannot be named.

According to the recommendation letter, Trump is nominated for the honour for his stand against radical Islam. CNN quotes the letter as praising the real estate mogul for “his vigorous peace through strength ideology, used as a threat weapon of deterrence against radical Islam, ISIS, nuclear Iran and Communist China.”

Nobel-watcher Kristian Berg Harpviken said the Nobel rules do not allow revealing the details of the process. While his shortlist does not include the Republican presidential candidate, it includes controversial figures like Edward Snowden.

Every year, thousands of people are nominated individuals and organisations for the Nobel Peace Prize. People, who are eligible for nominating, include government ministers, members of parliament, university professors and former laureates, an earlier AFP report said.

Being nominated should not be considered as a sign of approval from the Nobel committee. According to Harpviken, this year the Nobel Peace Prize may go to Snowden, the American whistleblower who exposed a mass surveillance program by the US National Security Agency.

“Snowden’s leaks led to a good number of reforms in US practice and US legislation, which make it harder to still argue that he is a traitor to his country,” Harpviken said.

Trump, who had widely considered to be the front-runner to win the Republican presidential nomination, suffered defeat in the Iowa caucuses. His GOP rival Ted Cruz surprised many by leaving Trump far behind.

Trump, who hosted a reality show until 2015, is a controversial figure in US politics. This is the first time he is running for the president. However, he talked about jumping into the race a number of times before.

CNN called him a “White House flirt” for talking about his probable presidential run at least three times before: in 1988, 2004 and 2012.