Efforts to pry loose President Donald Trump’s tax returns at the state level have hit a wall, stalling in statehouses across the country including in California, a hotbed of anti-Trump resistance.

Democratic Gov. Jerry Brown vetoed legislation late Sunday that would have forced presidential candidates to make their tax returns public before appearing on the California ballot, marking the death there of a measure once ballyhooed by Democrats and open government advocates as an end-run to Trump’s refusal to disclose his tax filings.

Democrats have seen similar proposals stall in more than 20 states since Trump’s election. But Brown’s veto here — in a deeply liberal state where Democrats control every statewide office and both houses of the Legislature — marked a new low for the offensive.

Breaking with lawmakers of his own party, Brown said in a veto message that despite “the political attractiveness — even the merits — of getting President Trump’s tax returns, I worry about the political perils of individual states seeking to regulate presidential elections in this manner.