Pennsylvania on Monday, Oct. 21, joined 18 other Republican-led states, introduced a “heartbeat bill” seeking to restrict or ban abortion once a fetal heartbeat has been detected.

Sen. Doug Mastriano (R-Pa.), and Rep. Stephanie Borowicz (R-Pa.) introduced the legislation and said it will take on the Supreme Court’s 1973 Roe v. Wade decision, which legalized abortion nationwide.

“When you hear a baby’s heartbeat, everything changes,” Borowicz said at a press conference unveiling the bill, according to PennLive. “If you can be declared dead when the heart stops why not declared alive when it starts?”

The bill would require doctors to determine whether the baby has a heartbeat before performing an abortion and if it does, a woman could only have an abortion if her health was at risk. Abortion is currently permitted in Pennsylvania up to 24 weeks into a pregnancy.

“We are asking the Commonwealth to stand with us,” Borowicz added. “Enough is enough. It’s time to turn the table. I believe we have the upper hand in Pennsylvania and across the nation. We will not be silent any longer.”

Democratic Gov. Tom Wolf has vowed to veto the bill should it reach his desk.”Let me be clear: I will veto any abortion ban that is put on my desk. The latest bill, a six-week abortion ban, defies all practical understanding of modern women’s health care,” Wolf said in statement.

The heartbeat bill has been either introduced or passed in 18 other states but none have gone into effect because they’ve either been vetoed or struck down in court.

“There’s something really wrong here,” Mastriano told Fox 43. “Something nefarious is going on. We turn our backs on the most vulnerable; those who don’t have a voice. And let them be massacred in the womb. We’re talking about the stats of the federal government, 60 million abortions since Roe v. Wade was legalized in the ’70s.”