The promise came after Trump's team failed to follow traditional press protocols and left behind a media pool assigned to cover the president-elect when he flew to Washington to meet with President Obama.
all-. prefix. only: used with many adjectives and nouns to show that something includes only the type of thing or person mentioned. all-. prefix. whole: used with many nouns to show that something includes the whole of something, or all the people or things of that type. all-. prefix. including everything: used with some adjectives and participles to show that something includes everything, or to add emphasis.
It is true that everybody and everyone refers to everybody and everyone in a group of people and everything refers to everything in a group of things. Even so, they are still perceived individually or as a totality, so the singular verb form is still maintained: