The vote comes just a week before Britain decides whether to leave the EU in a referendum. Twenty-seven members of the upper house, the Council of States, voted to cancel Switzerland's longstanding EU application, versus just 13 senators against. Two abstained the Neue Zürcher Zeitung reported.

Thomas Minder, counsellor for the state of Schaffhausen and an active promoter of the concept of "Swissness," said he was eager to "close the topic fast and painlessly" as only "a few lunatics" may want to join the EU now, he told the newspaper.

In the aftermath of the vote, Switzerland would give formal notice to the EU to consider its application withdrawn, the country's foreign minister, Didier Burkhalter, was quoted as saying by Neue Zürcher Zeitung. The original motion was introduced by the conservative Swiss People's Party MP, Lukas Reimann. It had already received overwhelming support from legislators in the lower house of parliament in March, with 126 National Council deputies voting in favor, and 46 against.

Hannes Germann, also representing Schaffhausen, highlighted the symbolic importance of the vote, comparing it to Iceland's decision to drop its membership bid in 2015. "Iceland had the courage and withdrew the application for membership, so no volcano erupted," he said, jokingly.