Historian: This was 'Friday Night Slaughter': Video: "There are NO Grownups in the White House now!"

• Andrew McCabe's firing in the dark of night started a chain of events raising the stakes in the Mueller probe

• McCabe has been interviewed by Mueller's team, source says

• On heels of firing, Trump lawyer calls for end of Mueller probe

• McCabe has memos documenting talks with Trump

• Firing is attempt to discredit the special counsel, McCabe says

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• Historian: This was 'Friday Night Slaughter'