a by-election
... that the French Constitutional Council triggered a by-election in a constituency representing French nationals in Spain, Portugal, Andorra, and Monaco?
... that the <a href="./Constitutional_Council_(France)" id="mwAc0" rel="mw:WikiLink" title="Constitutional Council (France)">French Constitutional Council</a> triggered <b id="mwAc4"><a class="mw-redirect" href="./French_residents_overseas'_5th_constituency_by-election,_2018" id="mwAc8" rel="mw:WikiLink" title="French residents overseas' 5th constituency by-election, 2018">a by-election</a></b> in a constituency representing French nationals in Spain, Portugal, Andorra, and Monaco?