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 Ruthven Hagan2020 Dems compete for top campaign operatives Senate GOP rejects Trump’s call to go big on gun legislation Politics is purple in North Carolina 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 McConnellSenate approves .3 trillion spending bill, sending to Trump GOP senator threatened to hold up bill over provision to honor late political rival: report Paul: Shutting down government not my goal MORE (R-Ky.), Sen. Richard BurrRichard Mauze BurrOvernight Cybersecurity: House Intel votes to release Russia report | House lawmakers demand Zuckerberg testify | Senators unveil updated election cyber bill Senators introduced revised version of election cyber bill Overnight Cybersecurity: Zuckerberg breaks silence on Cambridge Analytica | Senators grill DHS chief on election security | Omnibus to include election cyber funds | Bill would create 'bug bounty' for State MORE (R-N.C.) and a number of other Republican power players.

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