A top Republican super political action committee came out against Rep. Mo Brooks, R-Ala., and called him a self-interested politician after he announced that he will enter the Senate special election to fill out the remainder of Attorney General Jeff Sessions' seat, which is currently held by Sen. Luther Strange, R-Ala.

"While Luther Strange was cleaning up the corruption in Montgomery, Mo Brooks was living the life of a Washington insider, opposing Donald Trump and failing to get a single bill signed into law in four terms in the House," Senate Leadership Fund spokesman Chris Pack said in a statement. "If Brooks can't cut it in the House, how can he be trusted to deliver results in the U.S. Senate?

"It's clear Mo Brooks is more interested in advancing his own career than he is with delivering for Alabama," the statement added.

The group announced last week that would support Strange, starting with a $2.6 million ad buy backing his candidacy.

The election for Strange's seat was initially scheduled to be held in 2018, but was moved up a year by Gov. Kay Ivey after former Gov. Robert Bentley resigned and pleaded guilty to campaign finance charges.

Brooks joins a crowded field for the seat, which includes Strange and Roy Moore, the former chief justice of the Alabama Supreme Court. Candidates have until May 17 to declare a run for the seat.