Goa, Sept. 5 -- US President Donald Trump has warned that the United States could target Iran's heavily fortified underground nuclear facility at Pickaxe Mountain "very soon" if American intelligence detects activity at the site.

Speaking to reporters at the White House on Friday, Trump defended the months-long US military campaign against Iran, saying Washington's primary objective was to prevent Tehran from developing a nuclear weapon.

"We're in five months now. And you know what we did in five months? They're not going to have a nuclear weapon; that's what we did," Trump said.

He further warned that Iran possessing a nuclear weapon could pose a serious threat to the United States and its allies.

Trump specifically referred to the P...