Regnery Publishing, a conservative publishing house, said Monday that it had picked up a book by Senator Josh Hawley, Republican of Missouri, after Simon & Schuster ended its contract to publish it in the wake of the assault on the Capitol.

Mr. Hawley had come under criticism for challenging the results of President-elect Joseph R. Biden Jr.’s victory and was accused of helping incite the mob that stormed the Capitol on Jan. 6. His book, “The Tyranny of Big Tech,” is scheduled to be published this spring, Regnery said.

Thomas Spence, the president and publisher of Regnery, said in a statement that the publishing house was proud to stand with Mr. Hawley. “The warning in his book about censorship obviously couldn’t be more urgent,” Mr. Spence said. His company’s statement said that Simon & Schuster had made Mr. Hawley a victim of cancel culture.

Most major publishers, including Simon & Schuster, one of the “Big Five” book publishers in the United States, publish books across the political spectrum. But Simon & Schuster said it called off its plan to publish Mr. Hawley’s book after the Capitol attack.

“As a publisher it will always be our mission to amplify a variety of voices and viewpoints: At the same time we take seriously our larger public responsibility as citizens, and cannot support Senator Hawley after his role in what became a dangerous threat,” Simon & Schuster said in a statement. The company declined to comment on Regnery’s accusations.

After his book was dropped, Mr. Hawley described it as “Orwellian.”

“Simon & Schuster is canceling my contract because I was representing my constituents, leading a debate on the Senate floor on voter integrity, which they have now decided to redefine as sedition,” he wrote in a post.

In recent years, Regnery’s best-selling authors have included Ann Coulter, the conservative pundit, and Senator Ted Cruz, Republican of Texas. Mr. Hawley’s book is about technology corporations like Google, Facebook and Amazon and their political influence.