Republicans have hit a roadblock in an effort that could deter nonprofits, individuals and other potential litigants from filing lawsuits to block President Donald Trump over his executive actions.

The proposal was included in the Senate version of Trump’s massive tax and immigration bill, but ran into trouble with the Senate parliamentarian, who said it violates the chamber’s rules. It is now unlikely to be in the final package.

Federal judges can already require plaintiffs to post security bonds, but such funds are commonly waived in public interest cases. The GOP proposal would make the payment of the financial bond a requirement before a judge could make a ruling, which critics said would have a chilling effect on potential litigants who wouldn’t have the resources to comply.