There is no 'nuclear button' on 's desk

Donald has boasted that he has a bigger and more powerful 'nuclear button' than North Korean leader Kim Jong Un - but the US president does not actually have a physical button.

Instead, the president has access to a portable device carried in a bulky briefcase with him at all times.

The 20 kg (45 lb) gadget has been nicknamed the 'nuclear football' because it is carried by a rotating group of military officers everywhere goes.

It is equipped with a radio transceiver and a book with prepared war plans.

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Donald Trump has boasted that he has a bigger and more powerful 'nuclear button' than North Korean leader Kim Jong Un - but the US president does not actually have a physical button

Donald has boasted that he has a bigger and more powerful 'nuclear button' than North Korean leader Kim Jong Un - but the US president does not actually have a physical button

HOW THE PRESIDENT FIRES A NUKE 

The process for launching a nuclear strike is secret and complex and involves the use of a portable device housed in a bulky briefcase.

The gadget has been nicknamed the 'nuclear football' because it is carried by a rotating group of military officers everywhere goes.

It is equipped with communication tools and a book with prepared war plans.

If the president were to order a strike, he would identify himself to military officials at the Pentagon with codes unique to him.

The codes are recorded on a card known as the 'biscuit' which is carried by the president at all times.

He would then transmit the launch order to the Pentagon and Strategic Command via a radio transceiver within the case.

's most recent nuclear threats came after Kim's new year address, in which he cautioned: 'The US should know that the button for nuclear weapons is on my table.'

mocked the claims, tweeting on Tuesday: 'Will someone from his depleted and food starved regime please inform him that I too have a Nuclear Button, but it is a much bigger & more powerful one than his, and my Button works!'

If the president were to order a strike, he would identify himself to military officials at the Pentagon with codes unique to him.

The codes are recorded on a card known as the 'biscuit' which is carried by the president at all times.

He would then transmit the launch order to the Pentagon and Strategic Command via a radio transceiver within the case.

It is unclear how 's counterpart in North Korea would launch a strike, as the Kim's nuclear procedure is shrouded in mystery.

While Kim claimed in his new year address that 'the whole territory of the US is within the range of our nuclear strike', it remains unclear whether the nation's weapons could actually reach US soil.

While Kim claimed in his new year address that 'the whole territory of the US is within the range of our nuclear strike', it remains unclear whether the nation's weapons could actually reach US soil.

Intercontinental ballistic missiles tested by North Korea in July 2017 are likely capable of reaching 3,400 miles (5,500 km), which could reach a US Naval Base in Guam.

Pyongyang is subject to multiple sets of United Nations sanctions over its atomic and missile programs, which it says it needs to protect itself against a possible invasion.

Instead of a stationary button, the president would use a portable gadget housed in a briefcase to launch a nuclear strike. The 20 kg (45 lb) device has been nicknamed the 'nuclear football' (pictured) because it is carried by a rotating group of military officers everywhere Trump goes

Instead of a stationary button, the president would use a portable gadget housed in a briefcase to launch a nuclear strike. The 20 kg (45

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