In regulatory Washington, where delay is usually synonymous with death, fiduciary rule proponents are lauding Alexander Acosta for not tacking on additional wait time to the best interest standard that is set to go into partial effect June 9 and full January 1.

But there is plenty in the new Labor Department Secretary’s announcement that portends their fanfare for him could be short-lived.

Acosta’s announcement in a Wall Street Journal op-edit Tuesday that the rule is solid law is good for proponents.

At the same time, his indication that he believes the best interest standard may not be solid policy may be bad for them.

The Labor Secretary’s statement that “Trust in Americans’ ability to decide what is best for them and their families leads us to the conclusion that we should seek public comment on how to revise the rule” is where their cheering could stop.

The Trump Administration’s idea what Americans to listen to listen to is considerably different than that of fiduciary rule proponents who also take up a wide range of investor protection causes.

Acosta’s urging of the now Republican-dominated Securities and Exchange Commission to become a “full participant” should give them pause.

He criticized the SEC for not taking a major role in the rule’s formation as has Republican SEC Commissioner Michael Piwowar -- many  times.

At the end of his piece Acosta promises to roll back regulations that harm American workers and families.