The GOP-aligned American Crossroads has reserved $1.1 million in North Carolina ahead of the state's competitive primary, a sign they're looking to boost establishment GOP pick Thom Tillis. 

Crossroads has reserved the airtime in April in the expensive Raleigh and Charlotte markets ahead of the early May primary.

Crossroads Political Director Carl Forti confirmed the buy, but wouldn't discuss whether the group aims at bolstering Tillis in the race.

"We can confirm $1.1 million reserved in Raleigh and Charlotte starting April 1. No comment at this point on the content [of the ads]," Forti told The Hill in an email.

Tillis, the North Carolina House speaker, is battling physician Greg Brannon (R), a Tea Party favorite, and a number of other GOP candidates in the race. He needs to win 40 percent of the vote to avoid a primary runoff, and the few public polls on the race have shown him to be well short of that mark even though his is the only candidate who's been on the air with ads.

Establishment Republicans have been pulling hard for Tillis in the race, seeing him as their best chance to defeat vulnerable Sen. Kay HaganKay HaganDemocrats can win North Carolina just like Jimmy Carter did in 1976 North Carolina will be a big battleground state in 2020 Linking repatriation to job creation MORE (D-N.C.) in the GOP-leaning state. Karl Rove, one of Crossroads's founders, has headlined fundraisers for Tillis, as have Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellMcConnell expects Paul to return to Senate next week Former Hill staff calls for mandatory harassment training Gaming the odds of any GOP tax bill getting signed into law MORE (R-Ky.), Sen. Richard BurrRichard Mauze BurrJuan Williams: The shame of Trump's enablers Five takeaways from the social media hearings Overnight Tech: Senators demand tech firms do more on Russian meddling | House Intel releases Russian-promoted ads | Apple CEO says 'fake news' bigger threat than ads | Ex-Yahoo CEO, Equifax execs to testify on breaches MORE (R-N.C.) and a number of other Republican power players.

This post was updated at 12:25 p.m.