Senate Democrats will force a vote to block the Trump administration from allowing states to make changes to their ObamaCare markets.

Under the Congressional Review Act, the Senate can overrule and block some actions taken by government agencies.

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While it’s unlikely to pass the Republican-controlled Senate, it gives Democrats another opportunity to hit the GOP on health care and protections for pre-existing conditions ahead of the 2020 elections.

“Everyone says they want to protect people with pre-existing conditions,” Sen. Mark Warner Mark Robert WarnerFBI director casts doubt on concerns over mail-in voting fraud Democrats call for declassifying election threats after briefing by Trump officials It's time to upgrade benefits MORE (D-Va.) told reporters at a press conference Wednesday.

“This is a chance for Republicans, on a simple up or down vote … to see where they stand.”

Guidance issued by the Department of Health and Human Services (HHS) allows states to waive some requirements of the Affordable Care Act (ACA).

That could lead to states offering ObamaCare subsidies for plans that don’t meet ObamaCare’s requirements and that don’t cover people with pre-existing conditions.

This could drive healthier, younger customers away from the ObamaCare markets, raising premiums for those who remain, health experts say.

“This would further erode the ACA’s health insurance marketplaces and split the health insurance marketplace into two: one market for young and healthy people, the second for older individuals and those who have pre-existing conditions,” said Sen. Jeanne Shaheen Cynthia (Jeanne) Jeanne ShaheenSenate Democrats introduce bill to sanction Russians over Taliban bounties Trump-backed candidate wins NH GOP Senate primary to take on Shaheen Democratic senator urges Trump to respond to Russian aggression MORE (D-N.H.).

“We know that this would drive up costs for comprehensive coverage and leave many with pre-existing conditions with no other affordable options.”

So far, no states have applied for these waivers to offer less comprehensive plans.

Instead, states have sought waivers to strengthen their ObamaCare markets, creating programs that help insurers pay down expensive claims for people with pre-existing conditions.

While Democrats running for president are focusing on "Medicare for All," Democrats in the Senate have tried to tie Republicans to the Trump administration’s attempts to “sabotage” ObamaCare.

The vote will give Democrats defending their seats in 2020 something to point to, and the opportunity to put vulnerable Republicans in the hot seat.

Sens. Martha McSally Martha Elizabeth McSallyThe Hill's Campaign Report: Presidential polls tighten weeks out from Election Day Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' New ABC/WaPost poll finds Trump edging Biden in Arizona, Florida MORE (R-Ariz.), Cory Gardner Cory Scott GardnerBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Cook Political Report shifts Colorado Senate race toward Democrat MORE (R-Colo.) and Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Billionaire who donated to Trump in 2016 donates to Biden Credit union group to spend million on Senate, House races MORE (R-Maine) are all top Democratic targets next year, according to The Cook Political Report.

Collins voted with Democrats on a similar resolution in October that would block the administration’s rule expanding access to short-term health plans that don’t meet ObamaCare requirements.

The Democrats' messaging on pre-existing conditions was successful in 2018, when House Democrats won back the majority.

The Democrats hope to win back the Senate in 2020, but face a tough election map.