In a race that could determine the chamber’s majority, GOP hopes to flip a Dem-held seat in a swing-state.

The GOP Senate Primary in Michigan, a battleground state, is getting more competitive as a wealthy businessman making his second run for office pours big money into a major statewide advertising blitz to take aim at the frontrunner in the race who is backed by the former president Trump.

A new campaign advertisement from Sandy Pensler that launches on Monday statewide in Michigan takes aim at former Rep. Mike Rogers’ role as the chair of the House Intelligence Committee ten years ago in the congressional inquiry into the deaths of an American ambassador and three others in the terrorist attack of Sept. 11, 2012.

The latest ad from the self-funded entrepreneur with deep pockets is shared by Fox News. Pensler says the ad is part of a seven-figure advertising buy that includes digital, cable and broadcast TV.

The Rogers campaign describes the charge made in the ad as “absolute nonsense.”

Rogers is a former FBI agent who served in Congress before being endorsed by the National Republican Senatorial Committee, the Senate GOP’s campaign arm. Rogers received the support of Trump in March. He is the presumptive nominee for the Republican Party. Rogers and the former president have teamed up twice in the last month to attend Trump campaign events held in the pivotal Great Lakes state.

Justin Amash is also in the GOP’s crowded primary field, along with Rogers and Pensler. In November, the eventual Republican nominee is likely to face off with Democrat Rep. Elissa slotkin in a race to replace longtime Senator Debbie Stabenow.

This is one of several seats that Republicans hope to turn from blue to orange in November, as they try to regain their Senate majority lost in 2020.

The 30-second advertisement alleges that Rogers assisted Hillary Clinton in covering up important facts regarding the Benghazi attacks. Clinton was Secretary of State in the Obama administration when the Benghazi attack took place.

The narrator of the Pensler ad calls this attack “Hillary Clinton’s biggest scandal” and claims that “Mike Rogers assisted Hillary in covering it up.”

The ad features a video clip featuring Kris Paronto. He was a former Army Ranger and one of a few CIA-contracted guards who defended the consulate in the aftermath of the attack. Paronto, along with other guards, claimed in a book they were instructed to stand down for 20 minutes by CIA and State Department representatives as the attack unfolded.

Paronto tells the story in the video: “I looked Mike Rogers straight in the eye and told him that we could have saved the life of the ambassador if we hadn’t been late.”

The narrator of the spot says, “Rogers called out soldiers as liars.”

Rogers then says in a clip that “it’s all just nonsense.” This did not happen as they claimed back then.

The House Permanent Select Committee on Intelligence report on Benghazi, which was polarized by its findings, highlighted that interagency and bureaucratic blunders were responsible for the deaths of the Americans. However it did not specifically blame Clinton or other American officials.

Rogers, in a piece of op-ed following the release of the report, wrote: “The Obama administration’s White House and State Department’s actions before, during and after the Benghazi terror attack on September 11, 2012. ranged from incompetence, to deplorable manipulation of politics in the middle of an election campaign.”

Rogers’ campaign responded to the charges in the new advertisement.

Chris Gustafson, Rogers’ campaign director for communications, told Fox News that “this is a complete falsehood and Sandy has chosen to once again work against President Trump.”

“Here are facts: Mike headed an investigation under House Intelligence jurisdiction in order to gather facts about Benghazi and create a timeline. They used their findings to vote for the creation of a permanent investigative committee, which resulted in the release of Hilary Clinton’s 30,000 emails. He said that any insinuation of the contrary would be an injustice to those Americans who died on that fateful day.

Mike Pompeo, former Secretary of State and former CIA director, also came to Rogers’ defense.

As someone who served as a member of the Benghazi Select Committee as well the Intelligence Committee I know that @MikeRogersForMI has done amazing work in bringing to light Hillary Clinton’s failures during her tenure as Secretary State”, the former Kansas congressman wrote on social media. “Any notion that there was a conspiracy is absurd and false. Mike Rogers was the only person who could have helped uncover Hillary’s 30k email, her rampant corruption and her failure to protect Americans.

Pompeo and Rep. Jim Jordan, both conservatives, have released a political analysis of Benghazi that is far more critical than the one Clinton and Obama gave.

Pensler has released his second commercial in the last week. The previous ad was aired as Rogers and Trump were at a rally together in Michigan. It targeted Slotkin because he failed to condemn Rashida Tlaib (D-Mich.) for her controversial remarks about the conflict between Israel’s war with Hamas.

Pensler claims in the advertisement that “Rashida” and “Elissa” have no moral compass. You’re an embarrassment for Michigan and America.

Republicans wanted to avoid a costly and explosive primary because Slotkin was the only Democrat candidate.

James Craig, the former Detroit Police chief and former Detroit Rep. Peter Meijer both ended their campaigns in February.

Pensler has pledged to continue running ads right up until the August 6th primary.

“He will spend a lot,” Pensler’s senior campaign adviser Stu Sandler said to Fox News. “We will keep airing them.”

Mike Berg, NRSC spokesperson, said that the committee will “do whatever it takes” to ensure Rogers is nominated by the party.

NRSC chair Sen. Steve Daines, of Montana, said at a Christian Science Monitor breakfast held in Washington recently that “I believe the Trump endorsement for Mike Rogers seals the deal” in this primary.

Sandler was the NRSC’s political director during the last election cycle, when Sen.