California Gov. Gavin Newsom announced Monday the state will not be doing business with Walgreens Boots Alliance over its decision not to dispense an abortion pill.

Last week, the national pharmacy chain said it would not distribute mifepristone in 20 states after conservative attorneys general threatened legal action.

In a tweet, Newsom criticized the decision, writing, “California won’t be doing business with Walgreens or any company that cowers to the extremists and puts women’s lives at risk. We’re done.” The governor’s office did not immediately reply to ABC News‘ request for comment.

Last month, the group of attorneys general sent a letter to CVS and Walgreens saying that if they sold mifepristone, they would be in violation of the Comstock Act, an 1873 law that makes it illegal to send contraceptives, substances that induce abortion, pornographic content, sex toys and any written material about these items.

Several of the states that signed the letter — including Alaska, Iowa, Kansas and Montana — currently allow abortion access, including abortion medication, according to the Guttmacher Institute, a research group focusing on sexual and reproductive health.

In a statement to ABC News last week, Walgreens said it sent a letter to each of the attorneys general confirming it would not sell mifepristone in their states

“From the outset, we have made our intentions clear to become a certified pharmacy to distribute mifepristone wherever legally possible,” a spokesperson said about the Newsom decision.

The spokesperson said Walgreen still intends to become certified under an FDA program to dispense the drug elsewhere but has not done so yet. Newsom has been outspoken about his support of abortion rights. After the Supreme Court overturned Roe v. Wade over the summer, he vowed to protect both women and healthcare providers.