Mueller Subpoenaed Trump Campaign for More Documents

Special Counsel Robert Mueller served U.S. President Donald Trump’s election campaign a subpoena in mid-October, according to two people familiar with the matter, in the latest sign that his criminal investigation is aggressively pursuing links between campaign officials and Russia.

The subpoena to more than a dozen campaign officials sought documents related to any contacts they had with Russian operatives, according to one of the people who requested anonymity to speak about sensitive investigative matters.