US President Donald Trump accused Tehran on Wednesday of "slowwalking" on a nuclear deal, after Iran's supreme leader Ayatollah Ali Khamenei said the latest proposal from Washington was against the national interest.

The longtime foes have held five rounds of talks since April to thrash out a new accord to replace the deal with major powers that Trump abandoned during his first term in 2018, but sharp differences remain over whether Tehran can continue to enrich uranium.

On Saturday, Iran said it had received "elements" of the US proposal through Omani mediators, the details of which have not been publicly disclosed.

"The proposal presented by the Americans is 100 percent against" notions of independence and self-reliance, Khamenei said in a televised speech, invoking ideals of the 1979

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