Decades of animosity between Iran and the United States are one of the main drivers of instability in the Middle East. Trump has previously taken a strong stand on Iran and particularly on a nuclear program which could lead to the development of atomic weapons. Iran says its nuclear aims are peaceful.

Shakeri, an Afghan national living in Iran, told the FBI that a contact in Iran’s paramilitary Revolutionary Guard instructed him last September to set aside other work he was doing and assemble a plan within seven days to surveil and ultimately kill Trump, according to a criminal complaint unsealed in federal court in Manhattan.

President Donald Trump on Wednesday said he hoped to immediately start work on a nuclear deal with Iran and expressed hope the country would “peacefully grow and prosper” the day after he signed an order to impose aggressive measures on Tehran.