NASHVILLE, Tenn. (AP) — Abortion rights supporters want a federal judge to toss out a 2014 constitutional amendment that made it easier to restrict abortion in Tennessee.

A group of Tennesseans opposing the amendment sued the state last year over the way the vote was counted.

The Tennessee constitution says amendments must be passed by "a majority of all the citizens in the state voting for governor."

Plaintiffs say that means the only valid votes for the amendment are those cast by people also voting in the governor's race.

Attorneys for the state argue the language refers to how many people must vote in favor of the amendment for it to be ratified. So if 1,000,000 vote for governor, at least 500,001 must vote in favor of the amendment.

The trial begins Tuesday.