I think the biggest resistance is the newly formed group called "Indivisible". There are news articles comparing them to the tea party resistance that occurred a few years back for the Republicans. Anyone remember the Tea party protesters with the tea bags hanging from their hats?
This new Indivisible group is slightly different because it welcomes people of all parties. They aren't as much party centric as they are mesage centric. They also seemed to have formed and spread into red states a lot faster than even the Tea Party spread. It's pure a grassroots movement.
I was surprised to find several local "Indivisible" groups already formed in my area which isa red part of a purple state (Florida). They even have a web site where people can find local groups in their area (by zip code).
https://www.indivisibleguide.com/local-action-groups/
I don't think the Tea party was this organized so early in their formation. It will be interesting to watch how the new grass roots movement of Indivisable to see what kind of impact they make. Right now they are forming and organizing and starting to take their message to US Representatives and US Senate. Let's see if they start getting involved in picking candidates like the Tea Party did.
The Tea Party is who propelled Marco Rubio to his first Senate win. I think Paul Ryan was elected as part of the Tea Party revolution too. This gives you an idea how powerful a movement can be.