United States President Donald Trump may have to resort to bombing Iran again, according to an American columnist and pollster. 

Henry Olsen told Ryan Bridge that Trump will not be satisfied until Iran ends its nuclear programme. 

"I think Trump may eventually have to go back to bombing. 

"Trump has already committed American prestige and his personal prestige to the ending of the nuclear programme." 

The President is always clear about his goals during negotiations and has been "very clear" about that objective, throughout the campaign, Olsen said. 

"Until he gets it, he's going to continue to use what's at his disposal, and that does include bombing and potentially a land invasion.” 

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