Former US President Donald Trump may not be on the ballot for the upcoming midterm elections, but yet again he'll loom large over the vote. Especially for Republicans.

The election is all "about his dominance of the party. It's about currying favor with the king," New York Times journalist Peter Baker tells Ian Bremmer on GZERO World.

Baker — who's co-authored a new book about the Trump presidency with The New Yorker staff writer Susan Glasser — believes one thing Trump accomplished in his four years in the White House was becoming the most transparent president in US history.