Dem Senator Thinks Comey Firing Could Lead to Impeachment?!?

Presidents fire political appointees all the time, and no FBI investigations have ceased. The Senate investigation into Russian involvement in the 2016 election is also continuing. So why are Democrats obsessed with painting this Comey firing as the worst thing President Trump could’ve done? Sen. Richard Blumenthal (D-CT) even told CNN’s Anderson Cooper that he thinks this could lead to impeachment…?!? Huh?