Can you be friends with someone whose political beliefs are totally opposed to yours?

We know all about political division in this country. But could you be friends with someone whose political beliefs are totally opposed to yours? Labour's Shadow Chancellor John McDonnell recently revealed that he could not be friends with a Conservative because of what he sees as the "human suffering" that Tories have caused. Phil Kelly's a Labour man to his core. Frank Shivers is a staunch Conservative. They've debated many issues on this programme, but could they ever be mates?