This is due to the heavy lobbying on the part of the existing automobile manufacturers combined with the fact that meeting the goals would seem to be a big disruption for the industry.

https://www.autosinnovate.org/posts/blog/repeal-gas-vehicle-...

https://www.autosinnovate.org/posts/press-release/house-repe...

See the membership here:

https://www.autosinnovate.org/about/our-members

..which includes companies like Hyundai, Kia, General Motors, Ford, Honda, etc. (which are currently the biggest players in the EV market behind Tesla in the U.S.), and of course the usual players without much headway in the EV space: Toyota, Subaru, Mazda, etc..

The ZEV sales requirements start with the 2026 model year, and steadily increase:

    Model| ZEV
    Year | sales
  -------+-------
    2026 | 35%
    2027 | 43%
    2028 | 51%
    2029 | 59%
    2030 | 68%
    2031 | 76%
    2032 | 82%
    2033 | 88%
    2034 | 94%
    2035+|100%