Democratic and Republican lawmakers believe next year’s battle for the Senate majority largely will hinge on the presidential race — and who wins the Democratic Party’s nomination.

Democrats think they have a shot at winning back the Senate and unified control of Congress, but only if their voters show up in mass to sweep Trump from office.

“It depends on who our candidate is,” said Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.). “We don’t win the Senate if we don’t win the presidency. Period. Stop. Getting that choice right is more important than anything else.”

ADVERTISEMENT

The party got a shot of confidence last month when Trump’s internal campaign polling leaked and showed him losing to a generic Democratic candidate in key swing states.

Democrats need a net gain of three Senate seats and the White House — or four without winning the White House — to regain the Senate majority. But their path is made more difficult because of the defense of vulnerable Sen. Doug Jones (D) in Alabama.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellTrump 'no longer angry' at Romney because of Supreme Court stance On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline The Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power MORE (R-Ky.) and other Republicans think Trump stacks up best against liberals such as Sens. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.), Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.) and Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif.).

The three candidates have endorsed “Medicare for All” and the Green New Deal and spoken about abolishing private health insurance and studying reparations for slavery, among other bold proposals.

McConnell has acknowledged the election will be a referendum on Trump, but he clearly thinks it will also become a test of the nation’s appetite for progressive policies depending on who the Democratic nominee is.

“It’s also going to be a referendum on what the House [Democrats] would do if they took over the government: the Green New Deal, Medicare for All, under which 180 million Americans would lose their private health insurance,” he told reporters late last month.

McConnell has said that he wants to make 2020 a “referendum on socialism,” a message Trump has also telegraphed.

Even if Sanders, a self-described democratic socialist, doesn’t win the Democratic nomination, McConnell wants to paint the eventual nominee as a candidate in his mold.

“I think Bernie Sanders is correct when he says he won the argument,” McConnell said, referring to Sanders’s claim that he has helped push the Democratic Party to the left by championing Medicare for All and free college tuition — two ideas that did not have support from the Democratic mainstream in 2016.

ADVERTISEMENT

“He may not win the election but he’s won the argument,” McConnell said of Sanders. “Whether you do or don’t like the president, it’s not the only thing that’s going to be on the ballot next year. The other thing that’s going to be on the ballot is do you really want to turn America in a socialist country.”

Sanders, Harris and Warren all raised their hands at last week’s debate when the candidates were asked if they would support abolishing private health insurance. Harris, however, later backtracked and said she misheard the question.

Senate Majority Whip John Thune John Randolph ThuneSenate passes resolution reaffirming commitment to peaceful transition of power Susan Collins faces political land mine with Supreme Court fight Abortion stirs GOP tensions in Supreme Court fight MORE (R-S.D.) said while Republicans have worked hard to recruit strong candidates, they are also counting on Trump to pull some of them across the finish line.

“We’ve got quality candidates who are positioned really well in their states. Hopefully, the president will act as some coattails, some positive coattails,” he said.

There is some anxiousness regarding the president’s polling numbers.

One Republican senator called Trump’s early internal polling showing him losing several key states “a wake-up call.”

“A wake-up call is probably the best thing that can happen right now,” said the lawmaker, who requested anonymity to comment on Trump’s political popularity. “In that sense, it probably tells them you have to work this thing hard, which is what they’re trying to do.”

Another Republican senator who faces a tough reelection next year said Trump’s numbers are likely to go up once Democrats get closer to picking a nominee who the GOP can attack.

“I believe you will see any shortfalls that the president has virtually evaporate when you get down to the personality-specific campaign after the primary,” the lawmaker 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.), a former chairman of the Democratic Senatorial Campaign Committee, said Democrats are growing more confident about winning back the Senate but admitted a lot has to go right for his party.

“There’s a lot of things that have to happen for us to take the Senate but I do think things are happening to move things in place so that we can,” he said.

Tester thinks Trump’s ongoing trade battles with Canada, Mexico, China and Europe will erode support for Republicans in rural areas, where they need strong turnout to counterbalance Democratic strength in urban areas.

“It’s either bad trade deals or no trade deals at all,” he said.

In Iowa, Sen. Joni Ernst Joni Kay ErnstTillis appears to reinforce question about COVID-19 death toll The power of incumbency: How Trump is using the Oval Office to win reelection Poll: Trump opens up 6-point lead over Biden in Iowa MORE (R) is seen as having a good chance to win reelection but Republican strategists acknowledge that she would be in serious trouble if Trump loses Iowa, which he carried by nearly 10 points in 2016 but former President Obama won in 2008 and 2012.

Ernst says it’s critical that Trump complete work on his trade deal with Mexico and Canada and end the trade war with China, all major markets of U.S. farm exports.

“I just think he just really needs to get out there. He’ll work it hard, he’ll rally his base, and I think they will come through for him,” she said when asked about Trump’s internal poll numbers which showed him weaker than many Republicans expected.

“He just needs to continue working on a number of these trade deals and other things that are important to them,” she added.

The parties’ performances in Senate races in 2008, 2012 and 2016 largely mirrored how they did in the presidential match ups.

Senate Democrats picked up eight seats in 2008 and two seats in 2012 when Obama won.

Senate Republicans outperformed expectations in 2016, losing only two seats when Trump won, despite an electoral map that appeared to heavily favor the Democrats.

Democrats felt confident they would win back control of the Senate in the 2016 election in large part because they believed Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE, their nominee, would beat Trump in key Senate battlegrounds such as Wisconsin, Pennsylvania, North Carolina, Florida, New Hampshire and possibly Iowa.

Obama twice carried all of those states — with the exception of North Carolina, which he won only in 2008.

As it turned out, Clinton won just one of those six battlegrounds: New Hampshire.

The Senate races largely reflected what happened on the presidential level.

Republican candidates such as Sens. Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' The Hill's 12:30 Report: Ginsburg lies in repose CHC leaders urge Senate to oppose Chad Wolf nomination MORE (R-Wis.) and Pat Toomey Patrick (Pat) Joseph ToomeyAppeals court rules NSA's bulk phone data collection illegal Dunford withdraws from consideration to chair coronavirus oversight panel GOP senators push for quick, partial reopening of economy MORE (R-Pa.) won upset races in states where Trump also upset Clinton.

Johnson, however, thinks he helped Trump across the finish line instead of vice versa, noting he won more votes than the top of the ticket in 2016.

“I helped him over the finish line. I got 74,000 more votes than he got. He doesn’t really like to hear that,” he said.