Sen. Jeff MerkleyJeffrey (Jeff) Alan MerkleyOvernight Energy: Dems take on Trump's chemical safety pick Dem senator slams Trump for dedicating golf trophy to hurricane victims Dem senator compares Trump to Marie Antoinette MORE (D-Ore.) on Tuesday joined a Senate Democratic bill that would amend ObamaCare to let people keep insurance plans that are being canceled under the law.

Merkely and Sen. Dianne FeinsteinDianne Emiel FeinsteinGun proposal picks up GOP support Gingrich: Banning rapid fire gun modification is ‘common sense’ House bill set to reignite debate on warrantless surveillance MORE (D-Calif.) both joined the Keeping the Affordable Care Act Promise Act on Tuesday. That makes six Democrats in support of the law, including sponsor Mary LandrieuMary LandrieuYou want to recall John McCain? Good luck, it will be impossible CNN producer on new O'Keefe video: Voters are 'stupid,' Trump is 'crazy' CNN's Van Jones: O'Keefe Russia 'nothingburger' video 'a hoax' MORE (D-La.).

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On Wednesday, Landrieu tweeted that Merkely is joining the "growing coalition" supporting her bill in the Senate.

Like Landrieu, Merkley is up for reelection next year, as are Sens. Kay HaganKay HaganLinking repatriation to job creation Former Sen. Kay Hagan in ICU after being rushed to hospital GOP senator floats retiring over gridlock MORE (D-N.C.) and Mark PryorMark PryorMedicaid rollback looms for GOP senators in 2020 Cotton pitches anti-Democrat message to SC delegation Ex-Sen. Kay Hagan joins lobby firm MORE (D-Ark.).

Landrieu's bill was introduced last week in response to the growing realization that millions of Americans will not be able to keep their current health insurance plan under ObamaCare due to new insurance standards in the law. That goes against President Obama's promise that if people like their health plan under the law, they would be able to keep it.

The addition of Merkley and Feinstein puts more pressure on the Obama administration to either find some administrative fix to the law, or accept congressional action.

The House will pass separate legislation on Friday from Rep. Fred Upton (R-Mich.) that would let people keep their plans.