Republicans will be trying to take over the Senate in 2018 after President-elect Donald Trump Donald John TrumpTrump: Kim Jong Un and I ‘fell in love’ Trump again goes after Warren as ‘Pocahontas’ Robert DeNiro wins Nobel for public service MORE’s election, but Democrats could make gains in the House of Representatives if Democrats regain the White House.

The Republican Party is the dominant force in both chambers of Congress, with its base of conservatives and evangelical Christians, and it holds 52 of the chamber’s 100 seats.

The chamber’s conservatives hold an average of 88 seats and the Democrats hold just 30 seats.

With the Senate, the Senate GOP will hold a majority of 67 seats.

If the party loses a seat to a Democrat, the Democrats control the Senate but lose the House, so a Democratic majority would likely be needed to take control of the House.

Democrats have a slim 52-48 majority in the Senate and only one Republican, Sens.

Lisa Murkowski Lisa Ann MurkowskiGOP Senate candidate targeted in GOP primary wins reelection in Alaska MORE (Alaska), is retiring.

The other Republicans who will retire are Sens.

Rob Portman Robert (Rob) Jones PortmanRepublicans call for Kavanaugh, accuser to testify before Senate Judiciary Committee Kavanaugh, Kavanaugh to testify Thursday as House panel begins probe MORE (Ohio) and Susan Collins Susan Margaret CollinsTrump orders new FBI probe into Russian interference in 2016 election Collins: I’m ‘not the only one’ who thinks Trump should be impeached Collins: ‘We’ll have to see what the evidence is’ on Trump’s ties to Russia Collins: Kavanaugh should be tried as a prosecutor and not a witness Trump’s ‘first choice’ for attorney general, but not ambassadorTrump announces that he will nominate Kavanaugh to lead FBI MORE (Maine), and Sen. Lisa Blunt Lisa Ann BluntThe Hill’s Morning Report – Trump’s top pick for attorney-general would be an extremist – and she could lose in AlabamaSen.

Lindsey Graham Lindsey Olin GrahamGOP senator calls for Kavanaugh Senate panel votes to repeal opioid bill Senate Dems to delay Kavanaugh confirmation for one week MORE (S.C.) also said he expects the Senate to return to a Republican majority in 2018.

The Senate’s Republican majority has been in the minority since January.

Democrats are hoping to regain control in 2018 as they aim to make it easier for President Trump Donald Matthew TrumpKavanaugh accuser to reveal identity of former classmate in lawsuit Trump to nominate Kavanaugh as attorney general Senate confirms Kavanaugh MORE to carry out his campaign promises to dismantle the Affordable Care Act, which Republicans want to repeal and replace.

Republicans will need to gain 25 seats to retake control of both chambers in 2018, which means Democrats could gain seats in both houses.

The GOP has not been able to win back the House in a midterm election since 1995.

Democrats are hoping that a win in 2018 will help them retake the Senate.

They also hope to gain more seats in the chamber to prevent Trump from taking a majority.

Republicans have a 52-seat majority in both the House and Senate, and the Senate has a 52 percent majority.

Democrats have been hoping to make gains with the help of the new generation of activists.

A 2018 election is expected to be the first time in the past 30 years that more than one-third of the population has participated in a race.

The Associated Press contributed to this report.