1. So-called collusion originated from HRC campaign, it's a part of political attack, we know that; 2. Flynn is a victim of witch hunt from previous regime on incoming admin members. Again, this is dirty politics. The witch hunt was initiated by previous admin's DOJ in the name of counterintelligence investigation. You can not have it both way: on one hand, you say your wiretapping on Trump team is counterintelligence in nature, it's for national security purpose, not targeting on your political opponents and for political purpose. On the other hand, you use this intercept information of counterintelligence to do political witch hunt on Flynn. Flynn didn't say, as you claimed, any sanction removal during his meeting with Russia ambassador. Even WaPo said in its report that "no any evidence of wrongdoing or illicit".
"The FBI in late December reviewed intercepts of communications between the Russian ambassador to the United States and retired Lt. Gen. Michael T. Flynn — national security adviser to then-President-elect Trump — but has not found any evidence of wrongdoing or illicit ties to the Russian government, U.S. officials said.
The calls were picked up as part of routine electronic surveillance of Russian officials and agents in the United States, which is one of the FBI’s responsibilities, according to the U.S. officials, who spoke on the condition of anonymity to discuss counterintelligence operations."
https://www.washingtonpost.com/world/national-security/fbi-reviewed-flynns-calls-with-russian-ambassador-but-found-nothing-illicit/2017/01/23/aa83879a-e1ae-11e6-a547-5fb9411d332c_story.html?utm_term=.7c5f4ffbd937