India, March 31 -- White House Press Secretary Karoline Leavitt said on Tuesday that some Iranian leaders were "no longer on planet Earth" because they had lied to the US and prolonged negotiations.

Her remarks came after the White House on Monday downplayed Iran's pessimistic response to its 15-point proposal, which Tehran's foreign ministry had described as "unrealistic, illogical and excessive."

"Some of the previous leaders are now no longer on planet Earth because they lied to the United States and they strung us along in negotiations, and that was unacceptable to the president, which is why many of the previous leaders were killed"

Leavitt said that what Tehran says publicly differs from what it communicates privately to US offic...