by-election
... that the French Constitutional Council triggered a by-election in a constituency where the winning candidate avoided a second round by 16 votes?
... that the <a href="./Constitutional_Council_(France)" id="mwJg" rel="mw:WikiLink" title="Constitutional Council (France)">French Constitutional Council</a> triggered a <b id="mwJw"><a class="mw-redirect" href="./Wallis_and_Futuna's_1st_constituency_by-election,_2018" id="mwKA" rel="mw:WikiLink" title="Wallis and Futuna's 1st constituency by-election, 2018">by-election</a></b> in a constituency where the <a href="./Napole_Polutele" id="mwKQ" rel="mw:WikiLink" title="Napole Polutele">winning candidate</a> avoided a second round by 16 votes?