Iran is pushing back against U.S. demands that it directly negotiate over its nuclear program or be bombed, warning neighboring countries that host U.S. bases that they could be in the firing line if involved, a senior Iranian official said. Although Iran has rejected U.S. President Donald Trump's demand for direct talks, it wants to continue indirect negotiations through Oman, a longtime channel for messages between the rival states, said the official, who spoke to Reuters on condition of anonymity. Iran has issued notices to Iraq, Kuwait, the United Arab Emirates, Qatar, Turkey and Bahrain that any support for a U.S. attack on Iran, including the use of their air space or territory by U.S. military during an attack, would be considered an act of hostility, the official said. Such an act "will have severe consequences for them", the official said, adding that Supreme Leader Ayatollah Ali Khamenei had placed Iran's armed forces on high alert.