Ahead of a career retrospective, Sue Williamson tells how the US pair are dragging her country ‘through the mud’

For more than 50 years, Sue Williamson’s art has been shining a light on South Africa’s problems – first to campaign against the apartheid state, and then to question how far the country has progressed in reconciliation and remembrance.

But as she prepares for her first retrospective exhibition, the 84-year-old artist has a new pair of targets in sight: US president Donald Trump and his billionaire, South African-born adviser, Elon Musk.