Many of the new groups are embracing as their bible “Indivisible,” a 27-page guide written by former congressional staff members that advises Tea Party-like tactics “to resist the Trump agenda.” Just as groups like FreedomWorks used Google maps to help expand local Tea Party groups, the website for the guide helps Trump resisters find Indivisible groups near them.

Last week, groups that organized the nationwide women’s marches in January announced local “Next-Up Huddles” to plan more local political actions, starting with crowds at town forums during the congressional recess beginning Feb. 20. And another group, the Town Hall Project 2018, is keeping a list of where members of Congress will hold meetings that week, encouraging constituents to show up the way Tea Partyers did in the summer of 2009.

“I want to take our country back,” said Katie Farnan, a member of Indivisible Front Range Resistance, which is among the groups calling, writing and showing up weekly with bagels and protest signs at Senator Cory Gardner’s district offices to urge the Colorado Republican to hold town meetings. “I hate to say that because it’s so Tea Party-ish, but it feels like we’ve lost it.”

“I don’t embrace the tactics so much that I want to say let’s go to the extreme,” Ms. Farnan added. “But I do embrace the idea that if your congressman wakes up worrying that he’s not going to be re-elected, it’s a good thing. I want him to wake up worried.”

The goal is to shake Republicans away from voting the party line for Mr. Trump’s agenda, and to stiffen the spines of Democrats who might be inclined to go along with it. In Missouri, members of the new Indivisible group have been showing up every Tuesday at the office of Senator Claire McCaskill, a Democrat, as well as her Republican counterpart, Roy Blunt. In New York, they have mobbed the district offices of Senator Chuck Schumer, the Democrats’ leader, and even demonstrated outside his Brooklyn home.

There’s some circularity here: The Tea Party loudly borrowed from the left, using as its guide “Rules for Radicals,” by Saul Alinsky, considered the father of modern community organizing. It urged followers to adopt the Alinsky playbook to block health care reform at the town halls of 2009: “freeze it, attack it, personalize it, polarize it,” as one widely circulated email advised.