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And as soon as the more mainstream parties start giving up the 'firewall' or cordon sanitaire the far-right will start cannibalising the right.

That’s why counties like Los Angeles have kept up vigilant monitoring and fly-murdering programs, sometimes with new tools, to protect the state’s agricultural cordon sanitaire from Napa and Sonoma to the Mexican border.

When it comes to far-right inroads in European politics, analysts sometimes invoke the French phrase cordon sanitaire, which originally referred to the boundaries of a quarantine zone during an outbreak of infectious disease.

RN leader Marine Le Pen told French radio that "it was urgent to establish a cordon sanitaire" between the parties.

"Cordon sanitaire" is a term used by some political parties to reject cooperation with movements viewed as too extreme.