- Fifty-three organizations list reasons why they believe Michael Flynn should not serve in this role
- The National Security Adviser position does not require Senate confirmation
"While deserving respect for the time he has served our country in uniform, we feel General Flynn is unfit for serving in this critical post," the organizations wrote in a statement. "His appointment will damage America's standing in the world and pose a threat to our national security."
Trump's transition team did not immediately respond to a request for comment by CNN.
In the letter, the organizations list several reasons why they believe Flynn should not serve in this role, which does not require Senate confirmation, including mentioning past Islamaphobic statements he's made and for peddling anti-Muslim conspiracy theories.
"He has written that 'fear of Muslims is rational' and said that 'Islam is a political ideology' and 'a cancer' that 'hides behind being a religion,' and continuously peddles the nonsensical fear of 'Shariah law' spreading in the United States," the letter said.
It also cites two separate occasions that show his ties to foreign governments, including reporting from CNN's Barbara Starr where he leaked classified US intelligence
to Pakistan and another CNN report when he was running a company
that was lobbying on behalf of foreign clients even as he was receiving classified intelligence briefings during the campaign.
In the latter instance, Flynn's lobbying company, Flynn Intel Group, had ties to Turkish interests close to the government of Turkish President Recep Tayyip Erdogan.
Some of the other organizations that signed the letter include Veterans For Peace, American Family Voices and Women's Action for New Directions.