Instead, the president dictates tweets to Mr. Scavino, who sits in a closet-size room just off the Oval Office until Mr. Trump calls out “Scavino!” Often, he prints out suggested tweets in extra-large fonts for the president to sign off on. (A single-page article that Mr. Scavino recently printed out for him ran to six pages after the fonts were enlarged, according to one person who saw it.)
https://www.nytimes.com/interactive/2019/11/02/us/politics/trump-twitter-presidency.html