Immigration reporter

Seth Klamann

Seth Klamann covers politics, immigration and the state house for The Denver Post. A proud Kansas City native and University of Missouri grad, he previously worked for the Colorado Springs Gazette, the Casper Star-Tribune and the Omaha World-Herald. Outside of work, he enjoys watching soccer, going on road trips and eating fried food.

Colorado gubernatorial candidate Victor Marx answers a question during a candidate forum with his opponent, Colorado Attorney General Phil Weiser, on Thursday, Oct. 8, 2026, in The Legacy building at the National Western Center in Denver. (Photo by Timothy Hurst/The Denver Post)

Victor Marx, an unorthodox candidate, aims to harness AI and bring more accountability to the state as governor

October 11, 2026 at 4:00 a.m.

Republican Victor Marx, if he wins the race for Colorado governor, says he's bring accountability to state government as a conservative. But how he'd govern is less clear, given a...

Four measures sponsored by Advance Colorado and its leaders -- Amendments 81, 82, 85 and 86 -- are shown on a 2026 ballot.

What is Advance Colorado, the conservative group behind a half-dozen big ballot questions in the November election?

October 8, 2026 at 12:25 p.m.

Advance Colorado has the backing of major Republican donors, but its shadowy approach has faced criticism for condensing complicated policy into ballot measures that may have impacts that are more...

Federal law enforcement officers detain a man during an immigration enforcement operation at the Cedar Run Apartments on South Oneida Street in Denver on Wednesday, Feb. 5, 2025. ICE raids were conducted at multiple apartment buildings across the metro area. (Photo by Hyoung Chang/The Denver Post)

Colorado’s Amendment 81 would open door to ICE cooperation. Critics warn of racial profiling, other risks.

October 6, 2026 at 4:00 a.m.

Amendment 81 would not fully upend Colorado's so-called "sanctuary laws," which limit cooperation with immigration authorities. But it's drawn split opinions from some law enforcement officials.

A U.S. Immigration and Customs Enforcement agent stands ready in full tactical gear near the intersection of South Colorado Boulevard and East Mexico Avenue in Denver on Feb. 5, 2025. Members of ICE, along with the Department of Homeland Security, performed immigration raids around Denver and Aurora. (Photo by RJ Sangosti/The Denver Post)

Amendment 81 would require Colorado law enforcement to alert ICE in certain situations

October 3, 2026 at 12:03 a.m.

Amendment 81 on Colorado's ballot would require law enforcement to alert federal immigration authorities after they charge an immigrant who may not have proper legal status with certain crimes.

Colorado Republican gubernatorial candidate Victor Marx answers questions from reporters at Spruce Mountain Ranch in Larkspur, Colorado, during his primary night results-watching party on Tuesday, June 30, 2026. (Photo by Hyoung Chang/The Denver Post)

Victor Marx faces $57,000-plus fine recommendation for campaign finance violations in governor’s race

October 2, 2026 at 5:48 p.m.

A state hearing officer recommended Friday that Victor Marx's campaign pay more than $57,000 in fines for "a pattern of knowing indifference" to Colorado campaign finance rules.

The former Hudson Correctional Facility is pictured in Hudson, Colorado on Thursday, July 23, 2026. The private prison giant Geo Group has signed a multiyear contract with the Trump administration to reopen a shuttered prison in Hudson, Colorado, and turn it into an immigration detention center. (Photo by Hyoung Chang/The Denver Post)

Colorado sues Trump administration in effort to block new ICE detention center from opening

September 29, 2026 at 4:24 p.m.

Colorado Attorney General Phil Weiser on Tuesday joined the flurry of lawsuits challenging the Trump administration's plan to open a nearly 1,200-bed immigrant detention center northeast of Denver.

Federal officers conduct an immigration enforcement operation at the Cedar Run Apartments on South Oneida Street in Denver on Feb. 5, 2025. ICE raids were conducted at multiple apartment buildings across the metro area, including in Aurora. (Photo by Hyoung Chang/The Denver Post)

ICE agents involved in two Colorado arrests deserve to be punished for violating order, federal judge says

September 28, 2026 at 5:11 p.m.

A federal judge in Denver says immigration agents involved in two arrests of immigrants in Colorado should be punished for violating a court order on warrantless arrests.

A detainee's hand is seen through a window behind a fence where protesters placed copies of detainees' medical records and drawings outside Immigration and Customs Enforcement's privately run detention facility in Aurora, Colorado, on Wednesday, Sept. 23, 2026. (Photo by Hyoung Chang/The Denver Post)

Pepper spray, health crises and rotten food: Inside Colorado’s only immigrant detention center

September 27, 2026 at 7:19 a.m.

In interviews with The Denver Post, current and former detainees described frequent fights and feelings of hopelessness. They say they’re often served inedible or rotten food that frequently gives them...

The front entrance of the Aurora ICE Processing Center, on Saturday, June 27, 2026, in Aurora, Colorado. (Photo by Timothy Hurst/The Denver Post)

Aurora immigration detention center put unit on a brief TB quarantine this month, detainees say

September 22, 2026 at 6:34 a.m.

The Aurora immigration detention center placed a housing unit on a brief quarantine earlier this month after detainees were told they'd been exposed to tuberculosis, detainees and advocates said.

Ohio dark-money group spends $2.2 million to support Colorado measure tightening mail-voting rules

September 19, 2026 at 4:00 a.m.

A conservative dark money group based in Ohio has dropped $2.2 million on a Colorado measure that, if passed by voters, would significantly tighten requirements for mail ballots.

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