Kavanaugh grew frustrated when it came to questions that dug into his private life, particularly his drinking habits and his sexual proclivities, according to three people familiar with the preparations, who requested anonymity to discuss internal deliberations. He declined to answer some questions altogether, saying they were too personal, these people said.

“I’m not going to answer that,” Kavanaugh said at one point according to a senior White House official, who said that the questions were designed to go over the line and that he struck the right tone.

The tense preparations underscore the monumental stakes of public testimony from Kavanaugh and Ford …