Republican candidate Trump has come under increased scrutiny over the past week after making controversial comments about groping women.
Following the second Presidential debate between Trump and Hillary Clinton at the weekend, Fisher - best known for her role as Princess Leia in the Star Wars franchise - took to Twitter to describe Trump as "entitled, elitist, racist, misogynist" and a "classless thug".
When one fan asked Fisher if she thought Trump's "sniffles" (it has been noted that Trump was sniffling repeatedly during both debates) meant that he was a "coke head", Fisher replied: "I'm an expert & ABSOLUTELY".
Trump has not responded to the allegations.
Fisher has spoken about her own use of cocaine in the past, saying: "Slowly, I realised I was doing a bit more drugs than other people and losing my choice in the matter".
@reimamy I'm an expert & ABSOLUTELY
— Carrie Fisher (@carrieffisher) October 10, 2016
Donald trump is a classless thug Trying 2 scare us in2 voting 4 him-an entitled, elitist, racist misogynist-dangerous, unkind & w/o empathy pic.twitter.com/CaWPgjd03J
— Carrie Fisher (@carrieffisher) October 10, 2016
I think I should pay more taxes than someone less fortunate. Donald is for the rich. He'll only take care of his own.
— Carrie Fisher (@carrieffisher) October 10, 2016
Isnt diplomacy part of the job of being president? With trump as president it will no longer being the highest office in the land. Low blow
— Carrie Fisher (@carrieffisher) October 10, 2016
With Trump as president we will lose the most important Christian principle, "Love thy neighbor....
— Carrie Fisher (@carrieffisher) October 10, 2016
Former Democratic politician Howard Dean previously suggested that Trump's sniffles were due to cocaine use, later apologising for the "innuendo".