That's a convenient excuse. The real reason is because he could never overcome a 60 vote cloture vote in the Senate and he just doesn't negotiate all that well. The only way he got his tax cut through was the hoakie reconciliation process, which was suppose to be revenue neutral.
There were not 60 republicans in the senate, but mcconnell could have used the nuclear option as he did for confirming judges
even so I get your point
getting 7 or 10 democrats to cross party lines during the mueller witch hunt was impossible for anyone to do since they really believed trump as guilty of treason