The super PAC aligned with Senate Majority Leader Mitch McConnell dumped another $630,000 into Alabama on Wednesday for a closing television and radio advertising package highlighting President Trump's endorsement of Sen. Luther Strange.

Combined with the spot attacking Roy Moore launched earlier in the week, the Senate Leadership Fund is blanketing the Alabama airwaves with a massive 2,000 gross ratings points push in the final week of the special GOP primary runoff; election day is Tuesday. Gross ratings points measure how frequently an ad is played, and 1,000 for one week is considered the standard amount required to ensure voters are able to view an ad at least once, if not more than once.

Each of the ads focus on Trump and his support for Strange versus Moore, the former chief justice of the state Supreme Court who has tried to position himself as the outsider in the race.

"Which Alabama conservative was endorsed by the NRA and National Right to Life Committee? Big Luther Strange," SLF's closing television ad says, as it opens with contrasting visuals of Strange and Moore. "Who's fighting with President Trump to build the wall? Big Luther Strange, again. And, who did President Trump give his complete and total endorsement to? That's right: Big Luther Strange."

The spot finishes with a photograph of Strange and Trump in the Oval Office.

Senate Leadership Fund's total investment in the Alabama Senate special is set to hit $9 million. McConnell and his supporters are concerned a Moore victory could encourage a series of well-funded primary challenges in 2018 against Republican incumbents.

Moore and his allies, including former top Trump advisor Steve Bannon, have attempted to use that against Strange, calling him McConnell's hand-picked establishment crony.

Republican insiders monitoring the race fear it might be working. Moore, a fiery social conservative, has led in most public opinion polls because of the strong anti-establishment fervor coursing through the GOP electorate in Alabama, although Strange has closed the gap down the stretch.

Trump is set to campaign for Strange on Friday evening in Huntsville, a key electoral battleground in northern Alabama where the incumbent could use some help beefing up his support.

"Looking forward to Friday night in the Great State of Alabama. I am supporting "Big" Luther Strange because he was so loyal & helpful to me!" Trump tweeted on Wednesday morning.

Strange was appointed to the Senate in January when Republican Jeff Sessions resigned to become U.S. attorney general. The winner of Tuesday's runoff will secure the GOP nomination and presumably be favored to win the special general election, and with it the right to complete the six-year term Sessions won in 2014.