An Oklahoma bill that could revoke the license of any doctor who performs an abortion has headed to the governor, with opponents saying the measure in unconstitutional and promising a legal battle against the cash-strapped state if it is approved. In the Republican-dominated legislature, the state's House of Representatives overwhelmingly approved a Senate bill late on Thursday. Governor Mary Fallin, a Republican, has not yet indicated whether she will sign it. Under the bill, doctors who perform abortions would risk losing their medical licenses. Exemptions would be given for those who perform the procedure for reasons including protecting the mother or removing a miscarried fetus.