Critics have promised a legal battle.

North Dakota Gov. Jack Dalrymple says he fielded scores of telephone calls in the days leading up to his decision to sign three anti-abortion bills that make the state the most restrictive in the nation to get an abortion.

He told The Associated Press on Tuesday night that calls were evenly divided between people supporting the bills and those calling on him to veto them.

One of the signed bills would ban abortions once a fetal heartbeat is detected, which can happen as early as six weeks into pregnancy. Another requires abortion doctors to be physicians with hospital-admitting privileges. The third bans abortions based on genetic defects such as Down syndrome.

Critics have promised a legal battle. The laws would take effect Aug. 1.