Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) warned on Monday that the battle for control of the Senate in the November election will be a "dogfight," with neither party currently having a "lock" on winning the majority.

McConnell, speaking to Fox News Radio, said Republicans are "on the defense" as they try to keep their Senate majority. Republicans are defending 23 seats, compared with 12 for Democrats, though many of them are in deep red states.

"Let me just say that the Senate majority has not been a certainty at any point this cycle. We always knew from the beginning, and I've said consistently, that it's going to be a dogfight," McConnell said.

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McConnell added that the makeup of the Senate map means Republicans have "a lot of exposure," where Democrats will try to unseat GOP incumbents. But he also pointed to Alabama and Michigan — where Democratic Sens. Doug Jones (Ala.) and Gary Peters Gary Charles PetersBiden's six best bets in 2016 Trump states GOP set to release controversial Biden report Democrats fear Russia interference could spoil bid to retake Senate MORE (Mich.) are on the ballot — as "really good" pickup opportunities for Republicans.

"I think it's a tough fight. We don't have a lock on it, nor do they. It's going to be a fight to the finish. Sort of like a knife fight in an alley," McConnell said.

Democrats are feeling increasingly bullish about their chances of taking back the majority in November as tightening in several key races has put them increasingly in striking distance in states including Arizona, Colorado, Maine and North Carolina, where GOP Sens. Martha McSally Martha Elizabeth McSallyTumultuous court battle upends fight for Senate Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee The Hill's Campaign Report: Biden goes on offense MORE (Ariz.), Cory Gardner Cory Scott GardnerOvernight 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 The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (Colo.), Susan Collins Susan Margaret CollinsSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (Maine) and Thom Tillis Thomas (Thom) Roland TillisThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting OVERNIGHT ENERGY: EPA head questions connection of climate change to natural disasters | Pebble Mine executives eye future expansion in recorded conversations | EPA questions science linking widely used pesticide to brain damage in children Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight MORE (N.C.) are on the ballot.

Democrats need to pick up three seats to win control of the chamber if the party also wins the White House or a net total of four seats to get an outright simple majority.

The signs of momentum for Democrats come as their candidates have outraised GOP incumbents in Arizona, Colorado, Kentucky, Maine, Montana, North Carolina and South Carolina.

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Meanwhile, the Democratic Senatorial Campaign Committee (DSCC) had its best-ever first-quarter fundraising haul at $28 million, though the National Republican Senatorial Committee (NRSC) raised $30.3 million in the first three months of 2020. The DSCC, however, outraised its GOP counterpart in March, bringing in $11 million to the NRSC's $9.1 million.

McConnell on Monday argued that it was "not new" that Democrats were outspending them and raising more money but noted that Republicans had held and expanded the majority in previous cycles.

"I think it is also true that the Democrats are doing a better job of raising funds in recent years than we have. But we took the Senate in 2014, we kept it in 2016, we increased our number in 2018, so the fact that the Democrats are raising more money shouldn't raise any eyebrows," he said.