When Republicans captured the House from Democrats in 2010, the most conservative members and activists took it as a cue to oppose President Obama without compromise. It stretched Speaker John Boehner between the many hardline members of his caucus and the need to govern with a Democrat in the White House—and eventually ripped apart his tenure.

Eight years later, the roles are reversed—House Democrats ascendant, Republicans on the decline, Donald Trump in the Oval—and Democratic leaders in Congress seem destined to experience similar stress to Boehner and that of his successor, Paul Ryan. The most observable hint, though, is not in the House, where Nancy Pelosi already has cut deals with dissenting voices in her ranks to ensure her return to the speakership. It’s in the Senate, where leader Chuck Schumer is taking heat from both southwestern Democrats and the progressive grassroots for his position on border security negotiations.