Iran said on Monday that the U.S. attack on its nuclear sites expanded the range of legitimate targets for its armed forces and called U.S. President Donald Trump a "gambler" for joining Israel's military campaign against the Islamic Republic, Reuters reported.

Ebrahim Zolfaqari, spokesperson for Iran's Khatam al-Anbiya central military headquarters, said the U.S. should expect heavy consequences for its actions.

"Mr Trump, the gambler, you may start this war, but we will be the ones to end it," Zolfaqari said in English at the end of a recorded video statement.

Iran and Israel traded air and missile strikes as the world braced for Tehran's response to the U.S. attack on its nuclear sites over the weekend, which Trump suggested could lead to the overthrow of the Iranian government, according to Reuters.