The phrase
"possible defection" means the likelihood or chance that someone may leave or abandon a group, an organization, or a team they were previously part of.
Full definition
However, Piccoli thinks this option remains unlikely: «Despite some common ground, there are significant differences between them... A deal would entail significant risks for both Di Maio and (Lega leader Matteo) Salvini,
including possible defections and a loss of popularity.»
While the House is far from vulnerable for Republicans, maintaining a strong majority allows for a stronger caucus and leeway
for possible defections.
Douglas Carswell faced a media scrum in the rain asking about
further possible defections, the Rochester and Strood by - election, and TV leader debates for the 2015 general election.
One alarm bell that sounded Thursday was
the possible defection of Sen. Marco Rubio from voting yes on the tax bill, putting the measure in peril.