Politics is heating up in Washington DC in the lead up to next year's presidential election, with Republicans voting to investigate impeaching President Biden. 

But so far, no evidence has been produced by the 121 House of Representative Republicans, with some now questioning the merits of the investigation. 

TVNZ US Correspondent Logan Church told Tim Dower that it seems like more of a stunt than a serious challenge. 

He says things are bound to get very messy between now and next November. 

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• Impeachment threats dismissed as political attack against Biden