Both sides can say they won the 2018 midterm elections.

Democrats regained the House majority for the first time since 2010.

Republicans not only held but added to their majority in the upper chamber.

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That split decision won't likely lead to a lot of deal-making in the new Congress next year, though both House Democrats and Senate Republicans will need to point to accomplishments when their majorities will be up for grabs in 2020.

Here's what to look for the rest of 2018 and into the new year.

Leadership battles

The focus will be on the House and the big question is: Who will be the next Speaker? Rep. Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (D-Calif.) is the odds-on favorite, but she will have to offer concessions to restless members of the Democratic Caucus who have publicly called for new leadership.

Pelosi, 78, has already floated the notion of being a “transitional” Speaker, though that is unlikely to win over her Democratic critics. And what exactly does “transitional” mean? Is that two, four or six more years? Pelosi will be pressed on this question. However, Pelosi has the experience of leading the House during a Republican president and passing landmark legislation, most notably the Affordable Care Act.

Finger-pointing

Republicans already were finger-pointing before the election about losing the House and that will only intensify now. House Republicans will blame the White House, and the president will likely point to the large number (44) of House GOP retirements — including the decision by Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) to leave Congress.

Republicans contend that the fight over now-Supreme Court Justice Brett Kavanaugh Brett Michael KavanaughOvernight Health Care: US coronavirus deaths hit 200,000 | Ginsburg's death puts future of ObamaCare at risk | Federal panel delays vote on initial COVID-19 vaccine distribution Senate GOP sees early Supreme Court vote as political booster shot Trump says he'll make Supreme Court pick on Saturday MORE and immigration rhetoric helped cement their Senate majority. But there will be much debate over whether that closing argument hurt the GOP cause to save the House.

While House Republicans are licking their wounds, Senate Republicans will aggressively seek to confirm more of Trump's judges, and perhaps another Supreme Court justice over the next two years. Meanwhile, Senate Democrats will need to regroup and again try to win back the majority in 2020.

Russia investigation

It's unclear when 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 will wrap up his investigation on alleged collusion between Russia and Trump's 2016 campaign. But with the election now over, most expect more news from the special counsel over the next several weeks or months. If House Democrats disagree with what Mueller finds, they will have the option of launching their own investigation next year.

Impeachment

A number of Democrats and liberals are itching to begin impeachment proceedings against Trump, something Democratic leaders have sought to contain. Democrats at the beginning of next year will be able to do so, even though it might not be in their best political interests. It's a decision that will weigh on Democratic leaders and Democrats maneuvering to take on Trump in 2020.

Possible White House staff shake-up

Will Trump shake things up again and bring new blood into the White House? Despite constant speculation that White House chief of staff John Kelly John Francis KellyMORE has one foot out the door, Trump publicly committed to him staying on until 2020.

Others to watch include Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE, Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE, Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE, Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenDHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections Democrats smell blood with new DHS whistleblower complaint MORE, Interior Secretary Ryan Zinke Ryan Keith ZinkeTrump extends Florida offshore drilling pause, expands it to Georgia, South Carolina Conspicuous by their absence from the Republican Convention Trump flails as audience dwindles and ratings plummet MORE and White House press secretary Sarah Huckabee Sanders.

Trump’s victories in the Senate will only make it easier for him to muscle through new nominees to replace officials such as Sessions. With a 51-49 majority, replacing Sessions might have been difficult. With a majority as large as 54 or 55 seats, it’s a lot easier.

2020 politics

There could be more than 30 major Democratic presidential candidates, with roughly a half-dozen senators expected to launch a bid for the nomination.

As is customary, likely 2020 candidates such as Sens. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.), Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.) and Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.) have said their attention was on the midterms. Now they and many others have to make decisions on whether to get in, and more importantly, when to get in.

Government shutdown

Lawmakers and the administration face a Dec. 7 funding deadline, and the chances of another government shutdown are significant. Trump wants a lot more funding for his border wall, which the left despises. Coming off a big win in the House, Democratic leaders in the lower chamber will be quite entrenched in their opposition to Trump's wall initiative.