Former GOP Rep. Cynthia Lummis files to run for Wyoming Senate seat

Former GOP Rep. Cynthia Lummis files to run for Wyoming Senate seat

Former Wyoming Rep. Cynthia LummisCynthia Marie LummisLiz Cheney and Rand Paul extend war of words Pressure rises on Cheney to make decision Former GOP Rep. Cynthia Lummis files to run for Wyoming Senate seat MORE (R) on Thursday officially filed to run for outgoing Sen. Mike EnziMichael (Mike) Bradley EnziHere are the lawmakers who aren't seeking reelection in 2020 Liz Cheney and Rand Paul extend war of words The Hill's Morning Report - 2020 Democrats set for Lone Star showdown MORE’s (R-Wyo.) seat in 2020.

Lummis, a former member of the conservative House Freedom Caucus, previously represented the Equality State as the state's lone House representative, but opted not to seek reelection in 2016.

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Enzi, 75, in May announced his plans to retire from the upper chamber after serving 22 years.

Lummis is likely to face a difficult primary challenge, with many speculating House Republican Conference Chairwoman Liz CheneyElizabeth (Liz) Lynn CheneyOvernight Defense: Trump says he has 'many options' on Iran | Hostage negotiator chosen for national security adviser | Senate Dems block funding bill | Documents show Pentagon spent at least 4K at Trump's Scotland resort Liz Cheney calls for 'proportional military response' against Iran Liz Cheney says world is more stable, 'safer' under Trump MORE (Wyo.) may opt to run for the position.

Former Wyoming Gov. Matt Mead, 57, has also been mentioned as a potential candidate in the race. Cheney, the No. 3 House Republican and the daughter of former Vice President Dick Cheney, previously sought to primary Enzi in 2014 before ultimately dropping her bid.

Lummis has not yet launched a campaign website or done media on her bid.

Bill Cubin, the treasurer of Lummis for Wyoming said despite the FEC filing to run, Lummis's camp said it doesn't constitute an official announcement.

"Cynthia will make an announcement regarding her plans in the near future. So, the news of the day, as far as Cynthia Lummis is concerned, is there is no news yet," he said in an email.

A GOP operative said to The Hill in a statement, “This looks like amateur hour. How do you file to run for office, without any campaign apparatus, but then claim you’re not actually a candidate?" 

Sen. Rand PaulRandal (Rand) Howard PaulDefense bill talks set to start amid wall fight Senate confirms two Treasury nominees over Democratic objections Liz Cheney calls for 'proportional military response' against Iran MORE (R-Ky.) encouraged Lummis — who previously endorsed him for president — to run for the position, two sources confirmed to The Hill.

Lummis, a former cattle rancher, was considered by the White House as a potential contender to serve as Interior secretary in 2017.

Updated at 4:36 p.m.