Simon & Schuster said Thursday that it would cancel the publication of an upcoming book by Missouri Sen. Josh Hawley, one of several members of Congress who tried to overturn the results of the presidential election.

Hawley, an ally of President Donald Trump, has been criticized for challenging the election results and accused of helping incite the mob that stormed the Capitol on Wednesday. His book, “The Tyranny of Big Tech,” was scheduled to be published in June.

“We did not come to this decision lightly,” Simon & Schuster said in a statement. “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.”