Chris Wallace, the host of “Fox News Sunday” and moderator of the first presidential debate between President Trump and Joe Biden, said that he hopes to remain as “invisible as possible” during their faceoff on Tuesday in Cleveland, Ohio. “I’m trying to get them to engage…to focus on the key issues…to give people at home a sense of why they want to vote for one versus the other,” he said. “If I’ve done my job right, at the end of the night, people will say, ‘That was a great debate, who was the moderator?’”