GOP super PAC targets Mo Brooks for past anti-Trump remarks

A top GOP super PAC with ties to Senate Majority Leader Mitch McConnell (R-Ky.) is targeting Rep. Mo BrooksMorris (Mo) Jackson BrooksGOP leaders pitch children's health funding in plan to avert shutdown Kermit the Frog, Ellen Degeneres among write-ins in Alabama special election Alabama Rep. Mo Brooks reveals he has prostate cancer MORE (R-Ala.) in the Senate GOP primary race in Alabama.

The Senate Leadership Fund released an ad Wednesday going after Brooks ahead of the August primary to fill the seat previously held by Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsSessions: 'We should be like Canada' in how we take in immigrants DOJ wades into archdiocese fight for ads on DC buses Overnight Cybersecurity: Bipartisan bill aims to deter election interference | Russian hackers target Senate | House Intel panel subpoenas Bannon | DHS giving 'active defense' cyber tools to private sector MORE.

The ad splices together clips of Brooks speaking out about then-GOP presidential candidate Donald TrumpDonald John TrumpDems flip Wisconsin state Senate seat Sessions: 'We should be like Canada' in how we take in immigrants GOP rep: 'Sheet metal and garbage' everywhere in Haiti MORE while attempting to tie him to House Minority Leader Nancy Pelosi (D-Calif.) and Sen. Elizabeth WarrenElizabeth Ann WarrenWarren: Trump is a 'racist bully' Poll: Oprah would outperform Warren, Harris against Trump in California Democrats continue to dismiss positive impacts of tax reform MORE (D-Mass.).

"Mo Brooks attacked President Trump, siding with them — not Alabama conservatives," a narrator says in the ad, which portrays Brooks alongside the Democratic figures.

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The Republican lawmaker repeatedly attacked Trump during the GOP primary, saying he couldn't be trusted and calling him a "serial adulterer."

Since Trump won the election, Brooks has become a vocal supporter of the president. 

On Monday, Brooks released a new Senate campaign ad that said if he is elected, he will fight to have Trump's U.S.-Mexico border wall funded, even if that means a government shutdown.

But his past criticisms of Trump could pose a problem for him in the race in Alabama, a state which Trump won handily in last year's presidential election.

The GOP super PAC ad, titled "Trust," is part of the group's $2.5 million ad campaign in Alabama’s upcoming special election. 

Steven Law, the head of the Senate Leadership Fund, said the special election will be a "test" to see if an "anti-Trump" candidate can win. 

"The Republican primary for U.S. Senate in Alabama will be the first test to see whether someone as stridently anti-Trump as Mo Brooks can survive in a state that is so overwhelmingly supportive of the President,” Law said in a statement.

The primary is scheduled for Aug. 15, and it will be followed by a runoff in late September and a general election in December.

Brooks is one of several candidates in the primary challenging Sen. Luther Strange, who was appointed to the seat earlier this year by then-Gov. Robert Bentley (R).

A Brooks campaign spokeswoman did not immediately return a request for comment.