New Delhi, Jan. 15 -- President Donald Trump has told his national security team that he would want any US military action in Iran to deliver a swift and decisive blow to the regime - and not trigger a long, drawn‑out war, as per a news report which cited a US official, two people familiar with the discussions and a person close to the White House as saying.

"If he does something, he wants it to be definitive," NBC reported a source familiar with the deliberations as saying.

No decision has been made and Trump's advisers have not been able to guarantee that a strike would quickly topple the Iranian leadership, the US official and two people familiar with the discussions told NBC News. There are also concerns about whether the US h...