The Guardian | Julian Borger : If the US imposes new restrictions on Tehran, Washington will find itself isolated – and without leverage to limit Iran’s nuclear programme, experts say

The content, tone and style of Donald Trump’s speech about Iran on Friday was a reminder of how much the current president of the United States relishes conflict.

With his domestic legislative agenda stalled at home and a federal investigation scrutinising his finances and his relations with Moscow, Trump has taken to finding enemies to rail against, including the press and black football players who kneel during the national anthem.

The tactic galvanises his core supporters and seems to rejuvenate him. He appeared similarly energised excoriating Iran on Friday. But taken into foreign policy, Trump’s visceral drive for confrontation threatens to add a second nuclear crisis to the one Trump has already escalated in the Pacific with North Korea.

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