None of the four Republican House members who are likely running for Senate next year support House Speaker John BoehnerJohn Andrew BoehnerJohn Feehery: A political forest fire Trump's pick for Federal Reserve chief is right choice at right time The two-party system is dying — let’s put it out of its misery MORE's (Ohio) plan for a short-term increase in the debt ceiling.

Reps. Todd Akin (R-Mo.) and Jason ChaffetzJason ChaffetzDem demands documents from TSA after scathing security report Chaffetz replacement sworn in as House member Democrats expand House map after election victories MORE (R-Utah) are firm nos, according to The Hill's Whip List, while Rep. Jeff FlakeJeffrey (Jeff) Lane FlakeGOP strategist donates to Alabama Democrat Sasse: RNC help for Roy Moore 'doesn't make any sense' Sasse calls RNC decision to resume support for Moore 'bad' and 'sad' MORE (R-Ariz.) said he "can't support the current bill." Rep. Denny Rehberg (R-Mont.) has not yet indicated which way he will vote.

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Akin faces a potentially tough primary challenge from former Missouri State Treasurer Sarah Steelman, and can't afford to give her an opening to run at him from the right. They each hope to be the nominee against Sen. Claire McCaskillClaire Conner McCaskillDemocrats turn on Al Franken Trump rips Dems a day ahead of key White House meeting The Hill's 12:30 Report MORE (D-Mo.), but risk running too far to the right in the primary to win the swing state.

Both parties are on the attack over the issue. Missouri Democratic Party spokeswoman Caitlin Legacki pointed out that Sen. John McCainJohn Sidney McCainGOP strategist donates to Alabama Democrat Meghan McCain knocks Bannon: 'Who the hell are you' to criticize Romney? Dems demand Tillerson end State hiring freeze, consult with Congress MORE (R-Ariz.) had described the "cut, cap and balance" approach to raising the debt ceiling favored by both Akin and Steelman "bizarre" and "foolish," and ripped them for their positions.

"If there were any questions whether Sarah Steelman and Todd Akin are too extreme for Missouri’s middle class families, this should remove all doubt," said Legacki in a statement. "Rather than supporting commonsense ideas and reasonable compromise, Steelman and Akin would rather play chicken with the economy to score political points. That’s not leadership, that’s recklessness."

The National Republican Senatorial Committee also attacked McCaskill for opposing BoehnerJohn Andrew BoehnerJohn Feehery: A political forest fire Trump's pick for Federal Reserve chief is right choice at right time The two-party system is dying — let’s put it out of its misery MORE's plan. "In yet another sign that she’s prepared to put the reelection efforts of herself and President Obama ahead of avoiding the federal government defaulting on its debt for the first time in U.S. history, U.S. Sen. Claire McCaskill joined with her liberal party leaders last night in signing a letter announcing her firm opposition to the two-step plan offered by House Speaker John Boehner which will be voted on by the House later today," NRSC communications director Brian Walsh wrote in an email Thursday morning.

Senate race politics could also be playing a part in other House members' decisions. Chaffetz is all but certain to challenge longtime incumbent Sen. Orrin HatchOrrin Grant HatchMcConnell names Senate GOP tax conferees Ryan pledges 'entitlement reform' in 2018 Utah governor calls Bannon a 'bigot' after attacks on Romney MORE (R-Utah) for the Republican nomination and is counting on strong Tea Party support, which he would likely lose if he backed Boehner's plan.

Flake has long been a crusader for fiscal conservatism, but has a political reason to oppose the plan as well: he has already lost favor with some Arizona conservatives because of past centrist votes in immigration, and while he doesn't yet have a primary challenger, a vote for this plan could invite one.

Rehberg, challenging Sen. Jon TesterJonathan (Jon) TesterGOP and Dems bitterly divided by immigration Senate panel moves forward with bill to roll back Dodd-Frank GOP defeats Schumer bid to delay tax vote MORE (D-Mont.), hails from a Republican-leaning but populist state, and was one of four Republicans to vote against the GOP budget plan authored by Rep. Paul RyanPaul Davis RyanMcConnell names Senate GOP tax conferees House Republican: 'I worry about both sides' of the aisle on DACA Overnight Health Care: 3.6M signed up for ObamaCare in first month | Ryan pledges 'entitlement reform' next year | Dems push for more money to fight opioids MORE (R-Wis.) that would have privatized Medicare.

The four also don't have to fear Boehner's wrath in the same way that other Republican House members do, since they won't be around much longer, meaning that the GOP leadership can't leverage their votes in the same way it could others.