Inside House Dems' most "vicious" internal fight in decades

• "They are going to be vicious," one senior House Democrat told Axios, speaking on the condition of anonymity to offer candid thoughts on a sensitive internal battle.
• The lawmaker predicted it will be Democrats' most brutal member vs. member primary since California Reps. Brad Sherman and Howard Berman faced off in 2012, or when Michigan Reps. John Dingell and Lynn Rivers fought over a seat in 2002.

Between the lines: There is an unusual amount of contentious public back-and-forth for a primary that isn't even officially happening yet, and it has the Progressive Caucus on edge.

• Axios reached out to over a dozen Progressive Caucus members for this story. Most said nothing or declined to comment, even on the condition of anonymity.
• Doggett and Casar have had a close political alliance, with Casar still touting Doggett's endorsement on his campaign website as of Wednesday.

What we're hearing: "Most of us are TRYING to stay out," a senior House progressive wrote in a text to Axios.

• "It's way too early [to] dish on this for me," said another lawmaker.

Zoom in: House Minority Leader Hakeem Jeffries (D-N.Y.), who has a policy of endorsing his incumbents when they face insurgent primary challengers, is unlikely to pick sides in this member vs. member race, sources told Axios.

• A Democratic leadership aide said there is a zero-percent chance he weighs in on the race.
• It's "dangerous to get involved," the senior House Democrat said.

State of play: Casar and Doggett would share a single Austin-based district under the new congressional map that Republican state legislators in Texas are proposing.

• The rare mid-decade redistricting effort comes as President Trump has urged Republican lawmakers to try to create additional GOP-leaning seats ahead of the 2026 midterms.
• Doggett, who has been repeatedly targeted by Republicans in redistricting during his over 30 years in Congress, currently represents much of Austin and its suburbs.
• Casar, a former Austin city councilman first elected to Congress in 2022, represents parts of southern and eastern Austin in a district that snakes down to San Antonio. Under the new map, the Austin portions of his district would be merged with Doggett's.

What they're saying: Both lawmakers are angling to run in the new 37th district, which would be heavily Democratic and centered in Austin.

• Doggett, in a campaign email on Sunday, wrote that "over 2/3 of my current constituents will remain in the Trump configured CD37" and that his "seniority is an asset, not a liability."
• He urged Casar to "not abandon his reconfigured CD35, in which he is the only incumbent," noting that it would be majority Hispanic and arguing that Casar could "use his organizing skills and populist message to win over the disaffected, particularly disaffected Hispanic voters."

The other side: Casar is ruling out a run in the new 35th district, a San Antonio-area seat that voted for Trump by 10 percentage points and contains just a tenth of his current constituency.

• Casar's chief of staff Stephanie Trinh wrote in a campaign email on Tuesday that Doggett sent out his email "without discussing it with Greg or his team" and said it contained "incorrect information."
• "Other than the fact that Republicans arbitrarily assigned this seat the same number as Greg's current one, there's no reason it would make sense for Greg to run in that district," she wrote.
• The 37th district, she added, "would include all of Greg's old city council district and nearly 250,000 of the people he currently represents."

The intrigue: A pair of progressives who spoke to Axios anonymously last week, noting that Doggett was the first House Democrat to call for then-President Biden to drop out of the 2024 election over concerns about his age, said the 78-year-old should take his own advice.

• But the senior House progressive, who spoke to Axios on Wednesday, said it is "sad to see the back door spin on age. Lloyd is anything but the problem."
• "Really hard to push out someone if indeed 2/3 [of the district] is Lloyd's," the lawmaker added, though they said Casar "has — rightfully — ambition. That has to come in play too."

The bottom line: "Nobody wants to see a primary between two progressive members," another House progressive told Axios. "This is the kind of thing Trump wants."

• "It's really difficult to see the two of them in a primary."