OKLAHOMA CITY (AP) — An Oklahoma City abortion clinic filed a lawsuit Friday challenging longstanding state laws that allow only physicians to perform abortions in Oklahoma, marking the sixth time in five years that the state's abortion restrictions have ended up in court.

The lawsuit, which was filed on behalf of the Trust Women clinic, contends that such laws are unconstitutional because they restrict access to abortions without any valid medical basis.

Attorneys for the clinic argue that nurse practitioners are fully capable of providing both medication-induced and aspiration abortions, whi...