Celebrity Apprentice ratings

Donald Trump taunts Schwarzenegger over Celebrity Apprentice ratings

"So much for being a movie star," wrote the US president-elect, who described himself as a "ratings machine".

In response, the actor called on him to work for all Americans "as aggressively as you worked for your ratings".

Monday's season launch was seen by an estimated 4.9 million people - down 43% on the last season premiere in 2015.