He had to do that as part of his tax return secrecy battle.
"Trump Says New York Tax Law Doesn’t Apply Because He’s Not President
Donald Trump said a New York law enabling Congress to ask for his state tax returns no longer applies because he isn’t president.
The law, known as the Trust Act, allows the state to share the president’s tax information with a congressional committee that asks for it.Trump sued the House and Ways and Means Committee to block it from requesting information.
“While the Trust Act is not the clearest statute, the best reading is that it does not apply to former presidents,” Trump’s lawyers wrote in a report to U.S. District Judge Carl J. Nichols in Washington, asking that he accept their interpretation."
