But your question seems to posit that this "will stand".
That is like saying what to do when the dictator takes over. "Kill him" .....if every legitimate redress is ruled out by the left in their fanasy of judicial tyranny. The left loves to claim to have checkmated people. But they are not in favor of self awareness--that is their fatal weakness. >
That's a nomination for "Understatement of the Year". There is a reasonable possibility that if he were to allow the legislature to revisit the rest of the budget, they could find enough to cut to get all the spending in without a tax increase.
As for impeachment, with a majority of at least one house of the legislature on the tax train and 2/3rds of both houses required for impeachment, that's not an option. However, recall is (at least until the SCON decides it's recall-proof).