Gas prices hit a $4 national average as the U.S.-Iran conflict escalates, defying Trump's demands for retailers to lower fuel costs.

Global oil prices briefly touched $90 per gallon early on Monday before both countries signaled a willingness to resume talks.

NEW YORK (AP) — U.S. gas prices jumped back to $4 a gallon on average Monday, as Washington's latest fighting with Iran renews strain on the flow of fuel worldwide.