Mental health advocates and public safety officials said the funding could help those in crisis and close gaps for those deemed incompetent to stand trial.
The call for an investigation comes after reports that Sen. Omar Fateh carried legislation for a group that endorsed him and a campaign volunteer was convicted in federal court.
Lawmakers had just hours left to finish $8 billion in spending and tax plans before a midnight deadline and several large bills had not yet been wrapped up.
The compromise plan was announced Saturday, May 21, and could be the state's largest tax cut proposal in state history. Lawmakers would have to adopt it and the governor would have to sign it into law before the changes could take effect.
Lawmakers face a Sunday deadline to complete spending and tax bills and to pass them through both chambers. As of Friday morning, they had extensive work left to complete before then.