Switzerland’s political establishment is lining up against a proposed constitutional overhaul of the country’s long-standing neutrality policy, with the right-wing Swiss People’s

Party the only major political force backing the initiative ahead of the September 27 referendum.

The “Safeguarding Swiss Neutrality” initiative, promoted by the Pro Suisse group and members of the People’s Party, seeks to enshrine the principle of Swiss neutrality as both “perpetual and armed” in the constitution.

If approved, the proposal would prevent Switzerland from joining military or defence alliances, taking part in foreign conflicts or imposing economic and diplomatic sanctions on countries involved in wars, except where such measures are required under United Nations obligations.

Opposition parties and campaigners argue that the proposal would leave Switzerland with significantly less room to respond to international crises and could ultimately undermine the country’s security.

The campaign against the initiative said on Monday that Switzerland should retain its traditional neutrality while avoiding rules that would unnecessarily restrict its ability to act on foreign and security policy.

The opponents have warned voters against what they describe as an excessively rigid interpretation of neutrality.

“Safeguarding Switzerland’s security requires cooperation,” the campaign said, arguing that Bern must remain able to work with international partners as Europe faces an increasingly volatile security environment.

The group said waiting until a crisis has already erupted to establish international cooperation could leave Switzerland with too few options.

The proposed ban on sanctions has also emerged as one of the central points of contention. Opponents argue that refusing to impose sanctions even in response to serious violations of international law would conflict with Switzerland’s democratic and international commitments.

They also point to the growing difficulties facing the United Nations Security Council, where veto powers can prevent collective action.

The referendum comes amid a broader debate in Switzerland over how the country should balance its historic neutrality with the changing security landscape in Europe.

Recent polling has suggested that the initiative currently faces an uphill battle to win majority support, although the final result will be decided by voters on September 27.