THE THING (ABOUT / WITH STH/SB) IS
Meaning of THE THING (ABOUT / WITH STH/SB) IS in English
used to introduce a problem about sth/sb :
The thing with Karl is, he's always late.
Oxford Advanced Learner's English Dictionary.
Оксфордский английский словарь для изучающик язык на продвинутом уровне.
2005