“The company is open to welcoming those authors who are being attacked, bullied, banned from social media, and, in some cases, outright rejected by politically correct publishers,” it said in a news release on Tuesday. It isn’t the only outlet for former Trump officials. Mr. Kushner, the former president’s son-in-law and former senior adviser, has signed with Broadside, a conservative imprint at HarperCollins, according to people familiar with the deal. Simon & Schuster has acquired Mr. Pence and Ms. Conway’s books, and Betsy DeVos, the former education secretary, has also sold a book. But All Seasons is staking out territory that some mainstream publishers are wary to venture into, by courting former Trump officials who staunchly supported the president through the bitter end of his administration, including those who echoed the president’s false claims that the election was rigged. The company plans to release a book in the fall by Mark Meadows, Mr. Trump’s former chief of staff, and another by Peter Navarro, Mr. Trump’s former trade adviser. Its founding was reported earlier by The Wall Street Journal.