Conspiracy theorist said to have been key promoter of false rumour about immigrants ex-president repeated in debate

Republicans are blaming the influence of Laura Loomer, a rightwing conspiracy theorist, for this week’s botched debate performance by Donald Trump, which included the former president repeating a bizarre and unfounded claim that pet cats and dogs were being eaten by Haitian immigrants.

Loomer flew with Trump on his private plane to Tuesday’s debate in Philadelphia and has been identified as a key promoter of the pets rumour, which has been dismissed as false by authorities in Springfield, Ohio, where the practice was alleged to have been taking place.

Loomer, who styles herself as an “investigative journalist”, last year promoted a conspiracy theory alleging that 9/11 was an”inside job”. On Wednesday she posted an unfounded allegation that Harris had worn earphones disguised as earrings during the debate.