The 53-47 is the R-D split of the Senate. 67 required with full Senate present. Dems would need 67-47 = 20 Repubs to cross over to pass. However, 2/3rds number depends on those PRESENT. So, if only 90 Senators are seated, it'd take only 60 votes, and Dems would then need only 60-47 = 13 Repubs to cross over (assuming all DEMs seated). Then, again, if late one night 2 DEMs and 1 Repub show up (in a legit session of some sort) and vote 2-1 to oust, it'd be done. You'd think this would at least require a quorum of the Senate to vote. But, it doesn't say that.  Those PRESENT.