Blue states have been taxing egregiously for years for excessive money collection and then it's residents could simply deduct these state taxes from their federal returns. It resulted in unchecked state and local tax policies in Cali.NY, Illinois where the voters never felt the results of the uncontrolled tax & spend policies of their states because the burden to pay for them was shifted to the entire rest of the country since they could deduct the cost from their federal tax return. Trump fixed that....now nobody can deduct more than 10k of state & local taxeson their fed return, and those voters in blue states will start to have some decisions to make in the voting booth.
Thank you Donald Trump.
SCOTUS wouldn't hear the case.
Link: https://www.foxnews.com/politics/scotus-turns-away-salt-cap-challenge