Supreme Leader of the Islamic Revolution Ayatollah Seyed Ali Khamenei on Sunday warned the US to avoid taking \"inappropriate action\" over its baseless allegations about Iran\'s involvement in an assassination plot, saying that Tehran would give a crushing response to any unwise move.\"If American officials are entertaining any illusions, they should know that any inappropriate action - whether political or security-related - will meet with the Iranian people\'s decisive response,\" he said in a speech in western Iran. The Leader, who has already labeled the plot claims \"absurd,\" warned, \"The Islamic Republic of Iran will confront any plot, or destructive or obstructive measures, with all its might.\" His remarks alluded to a new plot staged against Iran by the US officials. On Tuesday Washington authorities said they had charged two Iranians, one of them a dual US citizen, with preparing to carry out a bomb attack on the Saudi envoy. The US officials claim that the plan has been \"conceived, sponsored and directed from Iran.\" Iranian officials have rejected the US accusation as baseless and a prefabricated, saying that Washington is seeking to divert the world attention from the growing Wall Street Protests in the country. Also, in his earlier remarks on Sunday, Ayatollah Khamenei pointed to the recent US accusations against Iran, and called them a single ring in the chain of plots hatched by the bullying powers to wage a political propaganda campaign against the Islamic Republic of Iran. \"They attempted to find an excuse through raising a meaningless and useless accusation against a number of Iranian nationals to wage a political propaganda attack on the Islamic Republic of Iran to introduce it as a sponsor of terrorism, but the conspiracy failed and will fail to produce any result and will remain futile and ineffective like their other measures,\" the Leader stated. His remarks came after the US officials, in their new wave of psychological operation, said they are consulting with allies and other countries on ratcheting up pressure on Iran, which is already subject to UN and US sanctions over its controversial nuclear program. Iran has fiercely denied any involvement in the thwarted plot to assassinate the Saudi ambassador to Washington. Tehran has stressed that the US allegations are baseless, and asked the US to show its proof. \"If Americans claim that they have evidence for the assassination of the Saudi envoy, they should present it since we are 100% assured of ourselves,\" Head of the Iranian parliament\'s National Security and Foreign Policy Commission Alaeddin Boroujerdi told reporters on the sidelines of an open session of the parliament here on Sunday.