US oil companies and Republican politicians attack Iran. When Iran can sell oil, it lowers profits for US and Saudi oil. Iran drives oil prices down by increasing supply. Iran will not sell oil in dollars. That angers the US. Republican oil wars purposely drive up gas prices. Read history. US oil companies toppled the Iranian government over the oil.

https://archive.nytimes.com/www.nytimes.com/library/world/mideast/041600iran-us-timeline.html