Republicans are on the cusp of winning the Senate majority after netting five seats overall and defeating two Democratic incumbents in Colorado and Arkansas.

The GOP needs to gain six seats to take the majority, and the party has pickup opportunities on the board in Iowa, Alaska and Virginia, where Sen. Mark WarnerMark Robert WarnerHillicon Valley: Federal inquiry opened into Google health data deal | Facebook reports millions of post takedowns | Microsoft shakes up privacy debate | Disney plus tops 10M sign-ups in first day Microsoft embraces California law, shaking up privacy debate Google sparks new privacy fears over health care data MORE (D) is narrowly ahead of Republican Ed Gillespie in a suprisingly tight race.

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Republicans have already picked up open seats in West Virginia, South Dakota and Montana, and they held on to a seat in Georgia, with David Perdue defeating surging Democrat Michelle Nunn without having to go to a January runoff. 

Vulnerable Kansas Sen. Pat RobertsCharles (Pat) Patrick RobertsEleven GOP senators sign open letter backing Sessions's comeback bid Pressure builds on Pompeo as impeachment inquiry charges ahead GOP lawmakers fear Trump becoming too consumed by impeachment fight MORE (R) also held on, beating back a vigorous challenge from Independent Greg Orman. 

Several late-closing states will prove crucial. Alaska Sen. Mark BegichMark Peter BegichAlaska political mess has legislators divided over meeting place Former GOP chairman Royce joins lobbying shop Lobbying world MORE (D) is seeking to hold off Republican Dan Sullivan, and it’s possible a close result in the sparsely populated state will lead to a recount or a very late call well into Wednesday. 

Arkansas Sen. Mark PryorMark Lunsford PryorTom Cotton's only Democratic rival quits race in Arkansas Medicaid rollback looms for GOP senators in 2020 Cotton pitches anti-Democrat message to SC delegation MORE (D) was the first incumbent to fall on Tuesday. Freshman Rep. Tom CottonThomas (Tom) Bryant CottonTom Cotton's only Democratic rival quits race in Arkansas Schumer concerned by Army's use of TikTok, other Chinese social media platforms Progressive freshmen jump into leadership PAC fundraising MORE (R) handily defeated the centrist lawmaker in a state that has slipped rapidly away from Democrats in recent years.

Colorado Rep. Cory GardnerCory Scott GardnerTariffs threaten 1.5M jobs: Study This week: House kicks off public phase of impeachment inquiry Progressive veterans group launches campaign labeling Trump as a 'national security threat' MORE (R) also knocked off Sen. Mark UdallMark Emery UdallDemocrats will win back the Senate majority in 2020, all thanks to President Trump Poll: Trump trails three Democrats by 10 points in Colorado The Hill's Morning Report — Trump and the new Israel-'squad' controversy MORE (D), defying Democratic cries that their vaunted ground game would save the vulnerable incumbent. 

Republicans also picked up a Democrat-held open seat in West Virginia with Rep. Shelley Moore CapitoShelley Wellons Moore CapitoHillicon Valley: Facebook to remove mentions of potential whistleblower's name | House Dems demand FCC action over leak of location data | Dem presses regulators to secure health care data Senators introduce bill to create 'parity' among broadband programs Republicans warn election results are 'wake-up call' for Trump MORE's (R) easy victory. 

South Dakota flipped to the GOP column after former Gov. Mike Rounds (R) won the open seat of retiring Democratic Sen. Tim JohnsonTimothy (Tim) Peter JohnsonTrump faces tough path to Fannie Mae, Freddie Mac overhaul Several hurt when truck runs into minimum wage protesters in Michigan Senate GOP rejects Trump’s call to go big on gun legislation MORE (D). The three-way race had become a late headache for the GOP with the addition of former GOP Sen. Larry Pressler (I), but with Republican attention and help the race turned again in its favor. 

Rep. Steve Daines (R) then won the open Democratic-held seat in Montana. 

With the early victories, Republicans are on the brink of their goal of Senate control. 

Sen. Mitch McConnellAddison (Mitch) Mitchell McConnellGOP divided over impeachment trial strategy On The Money: Trump asks Supreme Court to block Dem subpoena for financial records | Kudlow 'very optimistic' for new NAFTA deal | House passes Ex-Im Bank bill opposed by Trump, McConnell Top House Democrats ask for review of DHS appointments MORE (R-Ky.) was declared the victor in his closely watched race as soon as polls closed in the Bluegrass State, defeating Democrat Alison Lundergan Grimes to earn a sixth term. Democrats had early hopes for the Kentucky secretary of State's candidacy, but her campaign couldn't take advantage of the senator's unpopularity in the state. 

McConnell might have to wait a bit longer to see whether he can add Senate majority leader to his title, however. 

A victor in the fight for the Senate majority may not be named until early Wednesday morning — or perhaps not even until December though. In Louisiana, there will be a runoff in December between Sen. Mary LandrieuMary Loretta LandrieuCongress needs to work to combat the poverty, abuse and neglect issues that children face Dems wrestle over how to vote on ‘Green New Deal’ Lobbying world MORE (D) and Rep. Bill Cassidy (R). Cassidy is seen to have an edge in the GOP-leaning state.  

There was good news for Democrats early on Tuesday too. Polls closed in North Carolina at 7:30 p.m., where Sen. Kay HaganKay Ruthven HaganDemocrats will win back the Senate majority in 2020, all thanks to President Trump The Hill's Morning Report - Presented by Better Medicare Alliance - Dems shift strategy on impeachment vote Former North Carolina Sen. Kay Hagan dies at 66 MORE (D) was clinging to a narrow lead over Republican state Speaker Thom Tillis.

In New Hampshire, Sen. Jeanne ShaheenCynthia (Jeanne) Jeanne ShaheenOn The Money: US paid record .1B in tariffs in September | Dems ramp up oversight of 'opportunity zones' | Judge hints at letting House lawsuit over Trump tax returns proceed Overnight Energy: EPA watchdog slams agency chief after deputy fails to cooperate in probe | Justices wrestle with reach of Clean Water Act | Bipartisan Senate climate caucus grows Overnight Defense: Trump, Erdogan confirm White House meeting | Public impeachment hearings set for next week | Top defense appropriator retiring MORE (D) was able to hold the seat from challenger former Massachusetts Sen. Scott Brown (R), though the Republicans was refusing to concede late Tuesday as the race had tightened after the networks initially called the race for the incumbent. 

— Updated at 11:07 p.m.