You can’t just have the country “quit using gasoline”.
Maybe they can raise gas taxes to influence demand and raise tax revenue at the same time.
Certainly encourage alternative energy. But Trump is not going for that.
But cutting off the supply purchased from Iran is not intended to get Americans off oil. It’s an ego move.
In the meantime, high gas prices takes money out of the economy and decreases purchasing power.
Not a good short term move for an election year coming up. For the president.
The glow of the tax cut will be faded by Nov 2020 and of gas prices are materially higher or rising because of his policy it will not be good for his election.