What is really a joke is throwing shade on Mueller and his investigative team.
The content of Trump's tweets do NOT reflect the mind set or the behavior of an unworried, innocent man. Nor do posts by his Trumpanzees show confidence in the likely outcome of the Mueller investigation(s).
Crow is on backorder. But we expect more in before the investigation is concluded. Your table is ready.
Kristol nails it:
After deep reflection on his his tweets this morning, I'm going to speculate that Donald Trump is kind of worried about what we'll learn today from the Special Counsel.
As for Mueller's cred?
The Senate unanimously confirmed Mueller as FBI director on August 2, 2001, voting 98–0 in favor of his appointment.[39
A graduate of Princeton University and New York University, Mueller served as a Marine Corps officer during the Vietnam War, receiving a Bronze Star for heroism and Purple Heart. He subsequently attended the University of Virginia School of Law.
Mueller has spent the bulk of his career in government service, serving at times as an Assistant United States Attorney, a United States Attorney, United States Assistant Attorney General for the Criminal Division, a homicide prosecutor in Washington, D.C., Acting United States Deputy Attorney General, and Director of the FBI.
A conservative Republican , Mueller was appointed or reappointed to Senate-confirmed positions by Presidents George H. W. Bush, Bill Clinton, George W. Bush, and Barack Obama.
Mueller received the following military awards and decorations: