Starting in 2017, many state legislators introduced bills to require presidential candidates to reveal their income tax returns, or be omitted from ballots. But the idea seems to have died out.
The only two state legislatures that ever passed such bills were New Jersey and California. New Jersey’s legislature passed its bill at a time when Chris Christie, a Republican, was Governor. He vetoed that bill. But starting in January 2018, New Jersey has a Democratic Governor, Phil Murphy. However, during 2018, the same bill, introduced on January 9, 2018, has made no progress.
In California, Governor Jerry Brown vetoed the bill.
Gerrymander Hacks in the usual suspect regimes are perhaps waiting on Nov 2018 gerrymander Congress election results —
ie how much doom for Trump in 2019-2020.