So this just happened —
State prosecutors in Manhattan have subpoenaed President Trump’s accounting firm to demand eight years of his personal and corporate tax returns, according to several people with knowledge of the matter.
The subpoena opens a new front in a wide-ranging effort to obtain copies of the president’s tax returns, which Mr. Trump initially said he would make public during the 2016 campaign but has since refused to disclose.
The subpoena was issued by the Manhattan district attorney’s office late last month, soon after it opened a criminal investigationinto the role that the president and his family business played in hush-money payments made in the run-up to the election. …
… The state prosecutors are seeking a range of tax documents from the accounting firm, Mazars USA, including Mr. Trump’s personal returns and those of his business, the Trump Organization. The subpoena seeks federal and state returns for both the president and the company dating back to 2011, the people said.
At least, William Barr can’t shut down state prosecutors. This tidbit is from TPM:
House Democrats have also subpoenaed Mazars for Trump financial records. Trump’s personal attorneys are fighting that subpoena in court and are awaiting an appeals court decision on the matter, after a federal judge upheld the subpoena.
I’m looking forward to further developments.