camp (out) (on) (someone's) doorstep

Translations
faire le pied de grue devant la porte de quelqu’un
Definitions
To wait very close to someone's home, office, or another location, often for a long time and sometimes overnight, in order to see or speak to them as soon as possible. This phrase is often used to describe reporters, fans, or protesters who are eager to get access to a person or event.