Louisiana has become the 25th state to make it illegal to do business with companies that boycott Israel.

Democratic Gov. John Bel Edwards on Tuesday signed an executive order that prohibits the state of Louisiana from contracting with any company that participates in a boycott of Israel. The order specifically names the Boycott, Divestment and Sanctions movement against Israel.

“Israel is America’s closest ally in the Middle East and a beacon of democracy in the region,” Edwards said in a statement. “The United States, and by affiliation Louisiana, have benefited in innumerable ways from our deep friendship with Israel. Any effort to boycott Israel is an affront to this longstanding relationship. I am pleased that Louisiana will join what is now a critical mass of states in supporting our closest ally.”

Pro-Israel activists have celebrated the spread of anti-BDS laws as a blow against efforts to isolate Israel with one-sided and discriminatory boycotts. But some civil libertarians say the laws muzzle free speech; the ACLU last year filed a federal lawsuit challenging an anti-BDS law in Arizona.

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Under the Louisiana order a vendor must certify in writing that it is not engaging in a boycott of Israel and will refrain from any boycott of Israel for the duration of its contract. The order also calls on the state to terminate existing contracts with companies if they currently are boycotting Israel or supporting those who do.

Earlier this year, the city council of New Orleans passed and then rescinded a resolution, drafted by anti-Israel activists, that would have prohibited investment with human rights violators.