The House of Representative's newest member, Rep.-elect Jimmy Gomez (D-Calif.), promised to take a hard line against President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's agenda once he takes office.

Gomez, the California assemblyman elected to replace Democrat Xavier Becerra Xavier BecerraState AGs condemn HUD rule allowing shelters to serve people on basis of biological sex OVERNIGHT ENERGY: Trump casts doubt on climate change science during briefing on wildfires | Biden attacks Trump's climate record amid Western wildfires, lays out his plan | 20 states sue EPA over methane emissions standards rollback 20 states sue EPA over methane emissions standards rollback MORE, will be sworn-in in the next few weeks and will soon become the 31st member of the Congressional Hispanic Caucus (CHC).

"My district really wanted me … to take a hard stance against a Donald Trump agenda," Gomez told The Hill.

Gomez, a former Capitol Hill staffer and labor organizer, won a contested Democrat-on-Democrat special election earlier this month.

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He'll take over one of California's most progressive seats, which Becerra held for 24 years before replacing Sen. Kamala Harris (D-Calif.) as the state's attorney general in January.

Gomez has held his seat in California's Assembly for five years, rising to become the chairman of the Appropriations Committee and a powerful voice in the legislature's Democratic supermajority.

Gomez's bully pulpit will all but disappear when he becomes the lowest-ranking member of the House, with few committee assignments to choose from.

But Gomez said his new role in the minority caucus comes with a clear, overarching legislative strategy.

"If Dems don't stick together we're going to lose," said Gomez.

"I give the House Dems credit. When they've stuck together they've been able to create fractures within the majority caucus.

"There's fraction within their caucus, our job is to cause them to fracture and compromise with us and not the other way around," he added.

Gomez cited the recent omnibus spending measure as an example to follow for the House Democratic minority. In that omnibus, Democrats were able to protect many government programs important to progressive voters.

California's voters, said Gomez, are demanding that their representatives protect progressive gains on issues such as healthcare, the environment and workers' rights.

That puts Gomez, whose Los Angeles-area district is diverse and liberal even by California standards, on the far left of his new caucus.

Gomez, who calls himself a "working-class progressive," says Trump's agenda is anathema to his electoral mandate.

"I don't believe [Trump] has the moral authority to lead on a lot of these issues. What I've always learned is that the devils are always in the details, and he doesn't provide any details," said Gomez.

Still, Gomez says he had good relationships with many Republicans in the California legislature, although he admits that's an easier task coming from a position of power.

"I was in the majority and they were very welcoming because they wanted to show me what their challenges were, and I was the chair of appropriations," he said.

Gomez said his California Republican colleagues offered to make introductions to their federal counterparts, because "they always said I treated them fairly when I was chair of appropriations."

Gomez said he looks forward to forming personal relationships across the aisle, although political connections might take longer.

"Hopefully once we get past this era of governance in our country's history we'll be able to get back to a place where we're more considerate," he said.

Gomez's district is among the safest for Democrats in the country -- as evidenced by Becerra's tenure -- so he's taking a long-game approach to his new position.

"In order for me to be successful here, I have to learn the rules," said Gomez.

"Parliamentarian rules, the rules of the House, how you get bills referred, really the nuts and bolts that most members don't ever want to know because it's a lot of work. But that's what really makes you successful."