Schumer was a member of the gang of 8 back in 2013. IIRC, he refused to have amnesty predicated on first achieving border security, not even under the Senate’s definition (translation: no security). Anyone who might be confused about his true motives - awarding citizenship to tens of millions of illegals, and zero enforcement - need only observe how he reacts when Trump enforces real border security during the next 4 years.
The political establishment desperately wants the illegals here.
Horrifyingly, all four GOP gang of eight members won primaries against respectable challengers and then won re-election. Opposition to amnesty among GOP voters is a mile wide and an inch deep. It’s just not an important issue to most of them. Maybe that has changed, but until one of the gang of eight loses office, we can’t say it has.
The biggest problem Trump is going to have is that he has almost no foot soldiers in Washington. It’s highly unusual to have a dissident at the top of a government with no base in lower levels of office.
Usually, you are not going to have a radical or reformist head of state until after there is a big parliamentary block with the same political orientation.