Declining PhD Interview I have applied to a PhD position some weeks ago. After thinking about the given topic and institute for a longer time, I don't want to do my PhD there anymore. They want to interview me but since I would not even accept an offer, I don't want to do the interview (additional stress).
How can I politely decline the interview?
Dear XYZ,
thank you for considering me for this position. Unfortunately, for personal reasons I am no longer considering this option. Hence, I have to decline this invitation.
With best regards, clearseplex

In other words, like you would politely say no to any other opportunity - polite, short, and without going into details why exactly you changed your mind.