The presence of hard-right conspiracy theorist Laura Loomer alongside Donald Trump on the campaign trail in recent days has raised questions, including from some Republicans, about the influence the controversial former congressional candidate may have on him.

Ms Loomer is well-known for her anti-Muslim rhetoric and for spreading conspiracy theories, including that the 9/11 attacks were an “inside job” carried out by the US government.

She joined Trump at an event on Wednesday commemorating the attacks, raising eyebrows and prompting outrage in some US media outlets.

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Now, she is known for her vocal support of Trump and for promoting a long string of conspiracy theories including claims that Kamala Harris is not black, and that the son of billionaire George Soros was sending cryptic messages calling for Trump’s assassination.

These posts led her to be banned from a number of platforms including Facebook, Instagram and even, according to her, Uber and Lyft for making offensive comments about Muslim drivers. She once described herself as a “proud Islamophobe”.