Seven US governors believe President Donald Trump deserves some accolades.

They cited what they called Trump's "transformative efforts to bring peace to the Korean peninsula" as reason for backing his nomination for a Nobel Peace Prize

In a letter this week to Norwegian Nobel Committee chair Berit Reiss-Andersen, South Carolina Governor Henry McMaster and six fellow governors wrote that Trump's "firm stance against nuclearization, coupled with his willingness to engage one-on-one with Pyongyang, has succeeded in opening new avenues of cooperation, friendship and unity between the two Koreas - and the rest of the world".

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The letter follows one from 18 US House Republicans, who earlier this month formally nominated Trump for the award amid preparations for a historic summit with North Korea's Kim Jong Un.

The National Republican Senatorial Committee has also promoted the idea, sending an email encouraging supporters to "Nominate President Trump to Win the Nobel Peace Prize" by adding their name to a list.

Governors are not listed among those who can officially make Nobel nominations, according to the organisation's website.