They called for a suspension of the rules to pass the bill without going through the normal process. That takes a 2/3rds majority.
The final vote total was 275-134, almost exactly 2/3rds.
Democrats voted 231-2 (Lipinski [IL] and Schrader [OR] voted no)
Republicans voted 44-130, with 21 not voting.
Independents voted 0-2.
The 21 Republicans who didn’t vote presumably were trying to secretly support the bill, since it would only have taken 2 or 3 more no votes to block it. (I’m not sure if the House uses 66.6% or 67% on these things…) The Democrats would probably have then passed it through the normal procedure, it would have just taken longer.
Final count: https://twitter.com/cspan/status/1343694322814898177
Update: The full voting results were just released: https://clerk.house.gov/evs/2020/roll252.xml