If the U.S. Senate won't fund President Donald Trump's proposed wall on the Mexican border and Republican Mo Brooks is elected as Alabama's new senator, a Bible-reading filibuster could ensue.

In a new Senate campaign ad, Brooks, a Congressman from Huntsville, said he would filibuster any spending bills if the Senate doesn't fund Trump's plan to build a wall along the U.S.-Mexico border.

"If I have to filibuster on the Senate floor, I'll even read the King James Bible until the wall is funded," Brooks said in the ad. "We're going to build that wall, or you'll know the name of every Republican who surrenders to the Democrats to break my filibuster. I give you my word, and I don't give my word lightly."

Brooks is seeking the Republican nomination for Alabama's Senate seat that was vacated by Jeff Sessions when he joined Trump's administration as Attorney General. Former Alabama Gov. Robert Bentley appointed Luther Strange to fill the seat until a special election is held.

Behind ousted Alabama Chief Justice Roy Moore, Brooks and Strange are competing for second place ahead of next month's special election primary. Moore leads the crowded pool of 10 Republican candidates, though the election is expected to head to a runoff.

Brooks used the new ad to show voters he is supportive of the President's agenda.

"President Trump promised a wall to keep us safe and to protect American jobs for American workers," Brooks said in the ad. "But even some establishment Republicans are blocking the way."

Brooks has criticized the Washington establishment, which he called "swamp critters," for pouring money into the Senate race. His opponent Strange is being backed by Senate Majority Leader Mitch McConnell and is supported financially by a Washington Super PAC.

Also seeking the Republican nomination for Senate are James Beretta, Randy Brinson, Joseph Breault, Dom Gentile, Mary Maxwell, Bryan Peeples and Alabama Sen. Trip Pittman.

The primary election is Aug. 15, followed by a Sept. 26 runoff if needed. The general election is Dec. 12.