Trump's moves to boost diesel supplies have not yet lowered prices ↧ ↧ Trump's moves to boost diesel supplies have not yet lowered prices US diesel prices remain at near record highs, up 70% since ​the US-Israeli war on Iran began despite two high-profile recent moves by President Donald Trump to boost supplies of the fuel: pressuring allies ‌to release emergency reserves and expanding access to tax-exempt red-dyed diesel.