Here's the sequence of events so far...
Trump hires Mike Flynn against the advice of basically everyone.
Flynn is revealed to have had undisclosed meetings with russian ambassador Sergey Kislyak, which opens him up to potential blackmail and security breaches.
Trump defends Flynn until a report reveals Flynn's Russian connections, at which point Flynn is promptly fired.
Comey and the FBI investigate Trump administration's connections with Russia.
Despite previously praising Comey, Trump fires him.
White House gives official statement saying Comey firing has nothing to do with Russia.
In an interview shortly after the firing, Trump goes against the WH statement and clearly states he fired Comey for investigating the russian connection.
The very next day, trump has a meeting with russian ambassadors, including Sergey Kislyak, in a meeting closed to the US press, but open to russian press.
In that meeting Trump revealed information classified at the very highest level of secrecy, shared with us by intelligence allies who explicitly stated the information was not to be distributed.
If anybody else in the position of President had done even 20% of the above, there'd be howls for impeachment.