President Donald Trump went on a tweetstorm about the Russia investigation. He accused his vanquished rival Hillary Clinton of obstruction of justice (without any evidence) and blamed others for his firing of FBI Director James Comey (even though Trump said he was planning to fire Comey regardless of any recommendation).
Q: Can President Donald Trump fire special counsel Robert Mueller?
A: Not directly. Only the deputy attorney general who appointed Mueller can fire him and only for cause. But Trump could fire the DAG, or order the special-counsel regulations repealed and fire Mueller himself.