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Donald Trump’s senior aide Stephen Miller has told how the US president is "making the world a safer place" by threatening North Korea.

Mr Miller, who is tipped to be the White House's next communications director, made the comments on Nigel Farage's LBC show, saying the president had been forced to ramp up the administration's rhetoric after "years of failed policy".

His remarks came as US Defence Secretary James Mattis warned North Korea to “cease any consideration of actions that would lead to the end of its regime and the destruction of its people".

That followed news that America was ready to “fight tonight” and President Donald Trump threatened to unleash “fire and fury like the world has never seen” on the nation on Tuesday.

While concerned analysts have slammed the US president's bombastic language, Mr Miller told Mr Farage: “The president inherited years of failed strategy on North Korea and we’re living through the results now.

“By definition, you have to have to change your strategic approach, your rhetoric, your entire thought process from the failed approaches of the past."

He said the threat posed by dictator Kim Jong-un's regime was urgent.

“We all understand, as President Trump has articulated, the depth of the threat and menace that is posed by nuclear proliferation," said Mr Miller.

Praising Mr Trump for being "so clear so publicly" about China's responsibility to deal with the isolated regime, Mr Miller claimed "the frankness, the straightforwardness" of the president's rhetoric was a positive step.

“If you look at what we’ve accomplished with our trip overseas, say to Saudi Arabia and the call for cracking down on the financing of extremism and encouraging countries in the Middle East to take greater charge of their own affairs.

“And you see the engagement of the world community on North Korea. You see passage of the UN Security Council resolution with the votes of China and Russia on North Korea - we are making the world a safer place.”

People took to Twitter to respond to the comments, with one saying Mr Miller was "making the world dumber".

Some criticised Mr Farage's interview style.

"Nigel Farage interviewed Trump Stephen Miller on LBC and it was exactly as fawning and weird as you'd imagine," said Mikey Smith.