To be fair, it's a Twitter dunk/paraphrase of this exchange with Sen. Grassley (not Cotton)
https://www.breitbart.com/politics/2021/02/22/watch-merrick-garland-refuses-to-say-he-will-keep-special-counsel-john-durham/
Point being that Garland is going to talk to Durham before making these kinds of decisions, which is appropriate