They're saying that they're counseling Mueller not to testify and the reason is because Mueller won't be able to give a good answer to the question when he knew there was no Russian collusion (when he was appointed), and Mueller can't legally explain his own crazy obstruction theory that a person who did not commit a crime obstructs justice (i.e. does not have First Amendment rights) when he criticizes the prosecutor investigating him for the non-crime.
Mueller is exactly who I said he was. A partisan hack. A swamp lifer lacking in professionalism.
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