Attorney General George Brandis wants the marriage equality debate to be resolved as soon as possible through a simple plebiscite question requiring people to give a "yes" or "no" answer.

"I'm not sure if it will happen at the cabinet meeting scheduled for tomorrow but I do agree and expect that this is a decision that the government should make very soon," Senator Brandis told Sky News on Sunday morning.

Senior ministers have been giving duelling media interviews over the past week on the question of whether introducing marriage equality should be dealt with by a referendum or a plebiscite.

Senator Brandis, the country's top law officer, has gone to considerable lengths to point out that the issue should most properly be dealt with by a plebiscite.