Senate Democrats representing red states are worried the House impeachment process may spin out of control and destroy any chance their party might have of winning back the majority next year.

These Democrats hope the House keeps its impeachment focus on the Ukraine controversy, and that Democrats act relatively quickly. If they do not, the red-state Democrats warn President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE could turn the tables on them.

“It’s really incumbent on the House to really be laser-focused. The president is a master of pivoting and deflecting and I think it’s really important to stay focused,” said Sen. Jon Tester Jonathan (Jon) TesterDemocrats shoot down talk of expanding Supreme Court Pence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans MORE (D-Mont.), who narrowly won reelection in a Republican-leaning state in 2018.

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Tester said the impeachment inquiry should be focused on Trump’s July 25 call with Ukrainian President Volodymyr Zelensky, where he pressed for an investigation of former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE.

Sen. Joe Manchin Joseph (Joe) ManchinThe debate over the filibuster entirely misses the point Trump plans to pick Amy Coney Barrett to replace Ginsburg on court Day before Trump refused to commit to peaceful transition, Aaron Sorkin described how he would write election night MORE (D), who represents Trump-friendly West Virginia, also warned of Democrats focusing on old issues.

“I think it’s much better if it’s going to be focused because there’s a whole load of hay out there that they’ve been talking about for so long,” he said.

Like Tester, he said the effort should be focused on Trump’s attempts to push Zelensky to investigate Biden.

“I just think anytime a foreign entity is involved, it needs to be investigated,” Manchin said.

Manchin isn’t sure his warnings will be heeded, particularly since many liberal Democrats favor a broader investigation that would pull in efforts related to former special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s investigation, along with complaints that Trump has used his office to benefit his businesses.

At the same time, Democratic leaders in both chambers appear to want to keep the focus on Ukraine, particularly with polls showing a growing number of voters back impeachment.

One Democratic senator who requested anonymity to discuss the dynamics within the Democratic caucus said Senate Minority Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.) has told his colleagues that Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) wants to keep the scope of the impeachment inquiry as narrow as possible.

The senator, who favors a broader scope, said that “people are worried” about potential political fallout within the Democratic caucus.

“The stakes go up for both sides at this point,” the source added.

Pelosi told reporters Thursday that the House inquiry will focus on Trump’s dealings with Ukraine, at least initially. She said there is a "consensus in our caucus” that Ukraine “is the focus of the moment because this is the charge,” referring to the whistleblower complaint against Trump. Even so, the six other House committees will continue to examine various allegations of presidential misconduct.

Democrats feel they have momentum on their side, and their confidence has been bolstered by expressions of concern over Trump’s conduct from former members of his administration and fellow Republican officeholders.

The president’s former homeland security adviser, Tom Bossert, expressed his misgivings Sunday when he told ABC’s “This Week” that Trump’s phone call with Zelensky left him “deeply disturbed.”

A new CNN poll shows that 47 percent of Americans surveyed now back impeaching the president, up from 41 percent in May as more Republicans and independents now say they support the prospect.

A CBS News poll published Sunday showed that 55 percent of respondents now support the impeachment inquiry into Trump and that independents are evenly split, 49 percent in favor and 51 percent opposed.

Republicans warn Democrats risk a political backlash similar to what they felt in 1998 during the GOP-led impeachment of President Clinton. Democrats picked up congressional seats in that year’s midterm election.

Sen. Doug Jones (D-Ala.), who is up for reelection next year in a pro-Trump state, said he doesn’t want impeachment to drag on and expressed concern it could drown out negotiations on a new trade deal known as the United States–Mexico–Canada Agreement (USMCA) and a multiyear highway authorization bill.

“Obviously we need to get to the bottom of all this quickly,” he said. “I want it to come to a head as quickly as possible. I think the American people deserve it to be resolved one way or another.”

Jones said the pending USMCA, which is now in jeopardy because of the brewing impeachment fight, is “a good thing for the state of Alabama.”

“I think there’s a lot of things that may get lost in the shuffle of this,” he said. “You obviously worry that you’ll get consumed but at the same time the Senate has not had a good track record this year legislating.”

Yet Jones, running as a Democrat in a state that Trump won by nearly 30 points in 2016, says that the gravity of the allegations against Trump are bigger than politics.

“Don’t ask me whether or not this is going to affect my election in 2020. Don’t ask me if it’s going to affect Joe Biden or Donald Trump,” he said on the Senate floor Thursday. “Ask me what is going to happen to the Constitution.”

Sen. Dianne Feinstein Dianne Emiel FeinsteinTrump plans to pick Amy Coney Barrett to replace Ginsburg on court Trump faces tricky choice on Supreme Court pick The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' MORE (D-Calif.), who sat as a juror in the Senate’s trial of Clinton in 1999, also said the process “shouldn’t drag on for too long.”

“It’s September. It ought to take a couple months and that ought to be it,” she said.