The House impeaches with a simple majority vote, the Senate removes with a 2/3 majority vote. It's been possible since the new House was sworn in, just not politically viable because without substantial justification it would only strengthen Trump's base by playing right into his narrative. Due to the contents of the Mueller report being very damaging and the incompetency of Barr it's quickly turning into a smart move for 2020.impeachment will never be politically viable until we route GOP from the senate.