"Different opinions are expressed and I make a decisive and final decision -- it is a very simple process," Trump tweeted. "I'm sure that Iran will want to talk soon."
Trump blasted the media reports about a turmoil in the White House over a series of steps taken by the administration to up pressure on Iran, saying "there is no infighting whatsoever."
The United States on Wednesday ordered non-essential staff to leave its embassy in neighbouring Iraq, claiming there is an "imminent" threat from Iranian-linked Iraqi militias.
Ten days ago, Trump also ordered an aircraft carrier and nuclear-capable bomber planes to deploy to the Gulf.
Opponents of Trump say that hardliners led by national security advisor John Bolton, who has long advocated toppling the Iranian government, are pushing the country into war.
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