How did Donald Trump election slogan find itself on Petworth House postcard?

Petworth House and Park has found itself unwittingly at the centre of a social media storm after a postcard of the National Trust property featuring its fallow deer was used to send anti-Semitic slurs to a University of Texas law professor at Harvard.

Among the remarks in the hate mail, the writer borrowed a Donald Trump election campaign slogan saying ‘we’re gonna drain the swamp at Harvard’.

The card was posted on Facebook by Sanford Levinson’s daughter Rachel who said her father was ‘not scared - mostly bemused’ and ‘strangely it seems to have been sent from England’.