Sam Nunberg, one of President Trump's earliest campaign advisers, has been subpoenaed to appear in front of a grand jury Friday as part of Special Counsel Robert Mueller's Russia probe, The Washington Post reports. Nunberg told the newspaper he will not comply with the subpoena and plans to tear the document up during an appearance on Bloomberg TV.

The backdrop: Per WashPost, the subpoena is asking Nunberg for "emails, correspondence, invoices, telephone logs, calendars and 'records of any kind'" pertaining to Trump and nine other people, including Hope Hicks, Steve Bannon and others.

Nunberg appeared on MSNBC with Katy Tur Monday to discuss his decision.