Being Quoted in High Places.

Six months ago I wrote in one of my diatribes against Donald the Dunderhead:

… if you want to make the world a better place you don’t build walls, you build bridges

So now I read a quotation from one of Jeremy Corbyn’s speeches in which he says ‘we should be building bridges, not walls.’

Is this plagiarism and can I sue? Or should I just be happy that he agrees with me?