Questions have been raised regarding the Government claim over changes likely to make it harder for Māori to claim customary marine titles.

The divisive Marine and Coastal Area Amendment Bill is likely to pass its third reading in the House tonight.

The Government claims it'll restore the legislation to its original intent.

Former Attorney-General Chris Finlayson says these changes aren't restoring any laws or clarifying anything.

"It doesn't clarify the law at all, it changes it. And if they want to do that, well of course Parliament's sovereign, but why don't they come out and say it - instead of indulging this myth?

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