The simple answer to this is tell him he is persona non grata.
The Sun (2013)
As with many cyclical, complex ecosystems interwoven within unavoidable human influence, there is no one simple answer at any given time.
Times, Sunday Times (2013)
The simple answer is he has got himself fit again.
The Sun (2016)
The simple answer to this question is yes.
Wallace, Louise M & Bundy, Christine Coping with Angina (1990)
The simple answer is often to do something bold and previously unthinkable.
Times, Sunday Times (2007)