COVID-19 vaccination policies for some sectors and public spaces are quickly emerging as one of the key proposals being put to Canadian voters during the first week of the federal election.Liberal Leader Justin Trudeau, who is running for re-election as prime minister, doubled down on Wednesday over questions about his plan to require proof of vaccination for all those looking to travel domestically as soon as this fall, amid a fourth wave primarily driven by unvaccinated people.Trudeau was asked on the campaign trail specifically whether people without a medical reason for not getting vaccinated will still be allowed to board a plane or train with accommodations.He said no.“Canadians know that the way to get through this pandemic is for.