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David Duke, the former leader of the Ku Klux Klan has congratulated Donald Trump on his inauguration as President of the United States.

The former leader of the racist hate group tweeted during the President's 20-minute inaugural speech today, saying "We did it!"

Duke has been a vocal supporter of Donald Trump throughout his campaign.

The white nationalist even suggested it was the support of the KKK that pushed the businessman into power.

And he declared Americans voting against Trump would be “treason to your heritage”.

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Trump drew fierce criticism after he failed to publicly disavow Duke's endorsement for several days, insisting he didn't know who he was.

Duke also said Trump could “become one of the greatest Americans to have ever lived” and posted a photo of the president-elect standing on top of a tank.

(Image: REUTERS)

In his inaugural speech, Trump warned American wealth had been “ripped from homes and redistributed across the world”, adding: “We must protect our borders from the ravages of other countries”.

He said: “From this day forward it’s going to be only America First. America First.”

And he vowed to tackle the problems of drugs and crime, saying: “This American carnage stops right here and stops right now”.