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. 

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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 HaganGOP braces for Democratic spending onslaught in battle for Senate Democrats will win back the Senate majority in 2020, all thanks to President Trump The Hill's Morning Report - Presented by Better Medicare Alliance - Dems shift strategy on impeachment vote 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 McConnellDemocrats: McConnell impeachment trial rules a 'cover up,' 'national disgrace' Romney pledges 'open mind' ahead of impeachment trial McConnell proposes compressed schedule for impeachment trial MORE (R-Ky.), Sen. Richard BurrRichard Mauze BurrJuan Williams: Counting the votes to remove Trump Hillicon Valley: Apple, Barr clash over Pensacola shooter's phone | Senate bill would boost Huawei alternatives | DHS orders agencies to fix Microsoft vulnerability | Chrome to phase out tracking cookies Senators offer bill to create alternatives to Huawei in 5G tech MORE (R-N.C.) and a number of other Republican power players.

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