MADISON, Wis. (AP) -- The Wisconsin state Assembly has passed a constitutional amendment that would make it more difficult to recall the governor and other officials from office.

But the measure is still a long way from becoming law. It must pass the Senate before the session ends next week, and clear the full Legislature again within the next two years. It also must win approval in a statewide vote.

The measure would only allow officeholders to be recalled if they have been charged with a serious crime or if there is a finding of probable cause that they violated the state code of ethics.

Under current law, no grounds are needed to seek a recall.

Gov. Scott Walker is facing a possible recall election as early as May.