Five years ago Laura Loomer, a far-right activist with a history of expressing bigoted views and a knack for generating publicity, filed an application for a trademark to protect her work in “the field of political activism.”

Ms. Loomer, 31, part of a generation of web-savvy right-wing influencers, decided to trademark the term she had coined for her signature move of ambushing people with unexpected, often embarrassing questions. She called it getting “Loomered.”

Already a well-known figure among internet obsessives thanks to her anti-Muslim activism, undercover sting operations and political stunts, Ms. Loomer found herself at the center of the presidential campaign this week when she traveled with former President Donald J. Trump. She went with him to Philadelphia for the presidential debate, and then accompanied him to Sept. 11 memorial events in New York City and Shanksville, Pa., which drew pointed criticism from Democrats and Republicans because she had previously called Sept. 11 “an inside job.”

Here’s more about Laura Loomer.

Why are politicians from both parties criticizing her?

Ms. Loomer has made a number of racist, sexist, homophobic and Islamophobic comments in the past. She has described Islam as a “cancer,” used the hashtag “#proudislamophobe” and once seemed to celebrate the deaths of migrants crossing the Mediterranean. In 2018, after Twitter banned her for frequent anti-Muslim content, she handcuffed herself to the company’s headquarters in New York and wore a yellow Star of David similar to those Nazis forced Jews to wear during the Holocaust (Ms. Loomer is Jewish).

After the billionaire Elon Musk bought Twitter, her account was reinstated, and she has since built up a following of more than 1.2 million people on the site (which Mr. Musk later renamed X) and has a web show. She often blasts out content praising Mr. Trump and viciously attacking anyone she might perceive as a rival.

Two days before she traveled with Mr. Trump to the debate, she wrote in a post on X that if Vice President Kamala Harris, whose mother was Indian American, won the election, the White House would “smell like curry.”

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