Roy Moore, the former Alabama Supreme Court chief justice leading the GOP field in the state's Senate race, is ripping 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's "D.C. slime machine" in a new ad.

The 30-second ad spot echoes President Trump's calls to "drain the swamp" in Washington and attacks the Senate majority leader for "spending millions to attack" Moore, an apparent reference to a Politico report that the Kentucky Republican's super PAC is gearing up to spend as much as $8 million to back Sen. Luther Strange's (R-Ala.) campaign.

"They lied about repealing ObamaCare. Now, Mitch McConnell’s D.C. slime machine is spending millions spreading lies about Roy Moore, bearing false witness," the ad's narrator says.

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"Why? We know why. We all know why," the ad continues. "Roy Moore is honest and Roy Moore is his own man. And Roy Moore fears God, stands for the Constitution, fights for what is right and believes what we believe.

"Drain the swamp. Send McConnell a message. Send them all a message," it says, showing the faces of prominent Democratic and Republican lawmakers, including House 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.), House Minority Leader Nancy Pelosi (D-Calif.) and Sen. John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE (R-Ariz.).

A poll released Monday put Moore at the front of the crowded GOP primary field in Alabama's Senate race, with 30 percent support. Strange is trailing in second place with 22 percent, followed by Rep. Mo Brooks Morris (Mo) Jackson BrooksOvernight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals,' official says MORE (R-Ala.) at 19 percent.

The candidates are set to face off in the primary election on Aug. 15. The general election will be held in December.

The candidates are fighting to fill the seat previously occupied by Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE, who left the Senate in February to take the helm at the Justice Department.