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Special Counsel Robert Mueller. Photo: Alex Wong / Getty Images

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.

Let him arrest me. Mr. Mueller should understand I am not going in on Friday.
— Former Trump adviser Sam Nunberg

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.

Go deeper

GOP Sen. Chuck Grassley announces run for re-election

Photo: Greg Nash/The Hill/Bloomberg via Getty Images

Sen. Chuck Grassley (R-Iowa), the longest-serving Senate Republican, announced on Friday that he's running for re-election in 2022.

Why it matters: The GOP is looking to regain control of both chambers of Congress in the upcoming midterm elections. Several Republicans had urged the 88-year-old senator to run to avoid another retirement after five incumbent senators said they wouldn't seek re-election.

China deems all cryptocurrency transactions illegal

A person walking past China's central bank in Beijing in August 2007. Photo: Teh Eng Koon/AFP via Getty Images

China's central bank declared on Friday that all cryptocurrencies are illegal, banning crypto-related transactions and cryptocurrency mining, according to Reuters.

Why it matters: China's government is now following through with its goal of cracking down on unofficial virtual currencies, which it has said are a financial, social and national security risk and a contributor to global warming.

Biden's big bet backfires

Two key dealmakers — Sen. Joe Manchin (D-W.Va.) and Sen. Mark Warner (D-Va.) — leave a luncheon in the Capitol yesterday. Photo: Kent Nishimura/L.A. Times via Getty Images

President Biden bit off too much, too fast in trying to ram through what would be the largest social expansion in American history, top Democrats privately say.

Why it matters: At the time Biden proposed it, he had his mind set on a transformational accomplishment that would put him in the pantheon of FDR and JFK.