But Congress won't be able to impeach him if the Republican majority has squandered its authority by overplaying an arguably lesser scandal that most people think boils down to lying about sex.
He should be impeached for his treason crimes, but he won't be if the Republican majority squanders its authority. 
mnli hypothesis: He should be impeached for his treason crimes, but he won't be if the Republican majority squanders its authority.  premise: But Congress won't be able to impeach him if the Republican majority has squandered its authority by overplaying an arguably lesser scandal that most people think boils down to lying about sex.