Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (R-Ky.) says in a new interview that he expects to see Republicans lose seats in the House and Senate this year as the party pushes to retain its majorities in Congress ahead of the 2018 midterm elections.

The top Republican in the Senate told The New York Times for a story published Saturday that "the odds are" his party will face losses in both chambers of Congress this year.

“The odds are that we will lose seats in the House and the Senate,” McConnell said.

“History tells you that, the fired-up nature of the political left tells you that. We go into this cleareyed that this is going to be quite a challenging election," he added.

McConnell also acknowledged a fundraising deficit faced by some GOP Senate candidates in key states, a figure he attributed to those challenging incumbent Democratic senators.

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“I concede the fund-raising problem,” McConnell said.

The average Democratic incumbent raised $2.1 million in the fourth quarter of 2017, with an average of $7.75 million cash on hand, while the average GOP challenger raised just $746,000 in the fourth quarter, and had an average of $1.05 million cash on hand.

McConnell was painting a rosier picture of the GOP's chances in the midterms as recently as last month, when he told Fox News that Republicans have "a pretty good map" going into the fall.

"The Democrats had a good map last year. We're optimistic we can keep the majority," McConnell said at the end of January.

"If we hold Arizona and Nevada and pick up some of these others we'll have a majority for two more years," he added.

But in December, McConnell was privately beginning to raise alarms, warning GOP insiders that the party risks losing both chambers of Congress to the Democrats. Republicans hold a narrow 51-49 seat majority in the Senate.

President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE reportedly plans to aggressively campaign for GOP candidates in 2018 as the party struggles to hold on to majorities in the House and Senate in November. Every member of the House is up for election in the midterms, while about a third of senators also face reelection.