 Bauer played the role of Trump in 2020 debate prep and is doing so again at Camp David. In his book, The Unraveling, Mr. Bauer said he studied hours of tapes of Mr. Trump as a businessman, candidate, and president before the 2020 debates. He wrote that he did not try to portray a Saturday Night Live version of Mr. Trump with makeup and costumes. Instead, he wrote, he used as much of the language as he did on topics that would come up in a debate.