Liberal filmmaker Michael Moore was an unwitting participant in a November anti-Trump rally that was allegedly organized by the Russians indicted last week for meddling in the 2016 presidential election.

According to the indictment of 13 Russian nationals released Friday by U.S. Special Counsel Robert Mueller, the defendants and their co-conspirators tried to sow discord in the U.S. political system by organizing dueling rallies for and against then-President-elect Donald Trump in New York City on Nov. 12, 2016.

One of those rallies, called “Trump is NOT my President,” was promoted on social media and MSNBC by Mr. Moore, who has routinely accused the president of colluding with Russia, The Daily Caller first reported.

I’ll be on “AM Joy” with Joy Reid in a few minutes on MSNBC. Then on to the march on Trump Tower! Protests everywhere today across the U.S.! — Michael Moore (@MMFlint) November 12, 2016

Mr. Moore also posted a video on Facebook of him reporting from the rally, calling Mr. Trump a “racist sociopath.”

Mr. Moore, a prolific tweeter, has yet to respond to the backlash surrounding his involvement in the Russian-sponsored event. His name was a trending topic on Twitter Tuesday morning.

He did, however, take offense to a tweet by Donald Trump Jr., who called the news about his involvement “amazing.”

“Don Jr—here’s what’s amazing,” Mr. Moore responded. “When Mueller takes you &your brother-in-law away in chains, &then he offers your dad this deal- ‘Resign the presidency now & we’ll let Don Jr & Jared go’- you’re going to find out what a sociopath your father is as he throws his own son under the bus.”

Don Jr—here’s what’s amazing. When Mueller takes you &your brother-in-law away in chains, &then he offers your dad this deal- “Resign the presidency now & we’ll let Don Jr & Jared go”- you’re going to find out what a sociopath your father is as he throws his own son under the bus https://t.co/lwLgQ30ty1 — Michael Moore (@MMFlint) February 21, 2018

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