Cruz called raising taxes on people in wealthy, staunchly Democratic states such as New York and California “a mistake.”

Cruz has teamed up with fellow conservative Sens. Tom Cotton (R-Ark.) and Rand Paul (R-Ky.) in calling for tax reform to include language repealing ObamaCare’s tax penalty on people who don’t buy health insurance.

The provision would raise an estimated $300 billion to $400 billion over the next decade, which Cruz and other Senate conservatives say could be used to lower individual tax rates even further.