“As a matter of our policy, we want to end all of those subsidies,” Kudlow said. “And by the way, other subsidies that were imposed during the Obama administration, we are ending, whether it’s for renewables and so forth.”

Asked about a timeline, he said: “It’s just all going to end in the near future. I don’t know whether it will end in 2020 or 2021.”

The tax credits are capped by Congress at 200,000 vehicles per manufacturer, after which the subsidy phases out. GM has said it expects to hit the threshold by the end of 2018, which means under the current law, its tax credit scheme would end in 2020. Tesla Inc (TSLA.O) said in July it had hit the threshold. Other automakers may not hit the cap for several years.