A pro-Trump group with ties to former White House chief strategist Steve Bannon is going after Sen. Luther Strange Luther Johnson StrangeSessions hits back at Trump days ahead of Alabama Senate runoff The biggest political upsets of the decade State 'certificate of need' laws need to go MORE (R-Ala.) in a new ad.

The ad by Great America Alliance casts Strange, who's facing a runoff election against former Alabama Supreme Court Chief Justice Roy Moore, as a Washington insider beholden to 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.).

“It’s time to drain the swamp,” the ad says. “Take your voice to Washington, and vote for someone to represent you. On Sept. 26, don’t let the swamp take over Alabama.”

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The ad was first reported on by Politico.

The ad also includes a clip of former Alabama Gov. Robert Bentley saying that Strange was the "first person" mentioned by McConnell to fill the Senate seat vacated 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 in February.

"I talked with Mitch McConnell, and the first person that he actually mentioned was Luther Strange," Bentley, who resigned earlier this year amid a sex scandal, says in the ad. "So Luther is not a stranger in Washington."

McConnell is backing Strange, while Bannon, who left the White House last month and returned to his post as executive chair of Breitbart News, is supporting Moore in the Sept. 26 runoff. Great America Alliance is also planning a digital advertisement supporting Moore.

Just last week, Andy Surabian, Bannon's former political adviser in the Trump White House, joined Great America Alliance as a senior adviser.

President Trump endorsed Strange last month ahead of the state's GOP Senate primary, though he has said little about the race since then.