A slew of May primary battles begin Tuesday as the Republican establishment looks to reassert their control over a divided GOP in a number of states.

Its first big test comes in North Carolina, where business-friendly GOP groups have gone all-in for House Speaker Thom Tillis as he seeks to avoid a primary runoff and turn his focus to Sen. Kay HaganKay Ruthven HaganTillis trails Democratic challenger by 7 points in North Carolina poll Tillis trails Democratic challenger by 7 points in North Carolina poll North Carolina businessman will challenge Tillis in GOP primary MORE (D-N.C.). The race is a top priority for the GOP as they seek to win back the Senate.

A win on Tuesday allows Tillis to conserve resources for the general election and train his fire on Hagan, who has had a narrow lead against Tillis in most recent public polls. But if he falls short he’ll have to slog it out for another few months, potentially hurting his chances in the general election and giving the Tea Party another shot.

In the eastern end of the state, establishment Republicans face a tough challenge in defeating Rep. Walter Jones, an iconoclastic Republican who’s been a regular thorn in the side of GOP leaders. He’s facing Taylor Griffin, a former Treasury official during George W. Bush’s administration who has backing from many establishment Republicans. Griffin has also been endorsed by former Alaska Gov. Sarah Palin (R), who he worked for while on Sen. John McCainJohn Sidney McCain#JohnMcCainDay trends on Trump's 73rd birthday #JohnMcCainDay trends on Trump's 73rd birthday New poll finds little GOP support for spending cuts to specific federal programs MORE’s (R-Ariz.) presidential campaign.

Establishment Republicans are also fighting for their preferred candidate to replace retiring Rep. Mike McIntyre (D-N.C.) and supporting House Speaker John BoehnerJohn Andrew BoehnerTed Cruz, AOC have it right on banning former members of Congress from becoming lobbyists Ted Cruz, AOC have it right on banning former members of Congress from becoming lobbyists Rep. Amash stokes talk of campaign against Trump MORE (R-Ohio) and Rep. David Joyce (R-Ohio) in their Tuesday primaries.

Democrats will narrow the field to replace former Rep. Mel Watt (D-N.C.), and former America Idol star Clay Aiken (D) will find out whether he’ll get to face Rep. Renee Ellmers (R-N.C.).

SENATE SHOWDOWN

AK-SEN (BEGICH): Republican Senate candidate Dan Sullivan has a big primary lead and trails Sen. Mark BegichMark Peter BegichFormer GOP chairman Royce joins lobbying shop Lobbying world Dem governors on 2020: Opposing Trump not enough MORE (D-Alaska) by 44 percent to 42 percent in an internal poll obtained by The Hill.

IA-SEN (OPEN): Senate candidate Joni Ernst (R) fires on ObamaCare, and shows off her pistol skills, in her newest ad.

GA-SEN (OPEN): The Atlanta Journal-Constitution had a front-page story detailing the “rough patches” in businessman David Perdue’s (R ) career. Perdue’s business record has provided fodder for his opponents in the race.

Democrat Michelle Nunn is out with a new ad, a soft positive spot of her talking about her grandmother and her faith.

MN-SEN (FRANKEN): Sen. Al FrankenAlan (Al) Stuart FrankenThe Hill's 12:30 Report: Mexican officials scramble to avoid Trump tariffs The Hill's 12:30 Report: Mexican officials scramble to avoid Trump tariffs The Hill's Morning Report - Tariff battle looms as Trump jabs 'foolish' Senate GOP MORE’s (D-Minn.) main Republican opponent, Mike McFadden (R), is out with a new ad touting his frugality in an interesting way. "My dad, Mike McFadden? He's cheap,” McFadden’s son Connor says in the ad. "When I was 10 and had to get stitches out after a hockey injury, the nurse said it would cost one-hundred bucks. Dad was so horrified he grabbed the scissors and took them out himself."

MS-SEN (COCHRAN): Sen. Thad CochranWilliam (Thad) Thad CochranThe Hill's Morning Report — Trump turns the page back to Mueller probe Trump praises Thad Cochran: 'A real senator with incredible values' The Hill's 12:30 Report: Trump, Democrats deal with Mueller fallout MORE (R-Miss.) is facing fresh attacks from his primary challenger, state Sen. Chris McDaniel, over his commitment to Mississippi, after a report revealed Cochran listed a Washington, D.C., location as his primary address on numerous official documents.

NE-SEN (OPEN): Nebraska Republican Senate candidate Shane Osborn described his duties as state Treasurer as broader than they actually were during his time in office. The revelation may give fodder to detractors who have labeled him as “dishonest” in a recent ad because of a memo circulated by his campaign defending his Naval service. But that ad has been taken down by two stations in the state, after confronted with a letter from the Osborn campaign challenging its veracity.

NH-SEN (SHAHEEN): Sen. Jeanne ShaheenCynthia (Jeanne) Jeanne ShaheenDesign leaks for Harriet Tubman bill after Mnuchin announces delay Design leaks for Harriet Tubman bill after Mnuchin announces delay Bipartisan senators push new bill to improve foreign lobbying disclosures MORE (D-N.H.) is touting her work for New Hampshire's veterans in the first ad of her campaign. Republicans, meanwhile, slammed her for failing to deliver on what they said was a 2008 campaign promise to bring a full-service veterans’ clinic to the state.

NC-SEN (HAGAN): Former presidential nominee Mitt Romney endorsed Thom Tillis’s Senate campaign, making him the latest establishment Republican to back Tillis ahead of Tuesday’s primary.

OK-SEN (OPEN): The New York Times profiled former Oklahoma House Speaker T.W. Shannon this weekend, looking at how his Chickasaw heritage could be a mixed blessing for the candidate as he seeks the Republican nomination for Senate in Oklahoma against Rep. James Lankford (R-Okla.). Meanwhile, conservative talk-radio host Hugh Hewitt endorsed Lankford in the race.

TN-SEN (ALEXANDER): State Rep. Joe Carr, the long-shot primary challenger to Sen. Lamar AlexanderAndrew (Lamar) Lamar AlexanderTaylor Swift thanks Cory Booker for signing Equality Act petition Taylor Swift thanks Cory Booker for signing Equality Act petition Senate health panel to move forward on package to lower health costs next week MORE (R-Tenn.), filed his personal financial disclosure forms months after his August entry into the race.

WV-SEN (MANCHIN): Sen. Joe ManchinJoseph (Joe) ManchinThe Hill's 12:30 Report — Presented by MAPRx — Trump takes heat for remarks on help from foreign governments The Hill's 12:30 Report — Presented by MAPRx — Trump takes heat for remarks on help from foreign governments The Hill's Morning Report - Trump and House Democrats resume battle MORE (D-W.Va.) hinted Monday that he might leave the Senate and will decide at the end of this year whether to run for governor again.

BATTLE FOR THE HOUSE

POLLS SHOW GOP MIDTERM EDGE: A Pew/USA Today poll released Monday found 47 percent of registered voters support the Republican candidate in their district or lean Republican, while 43 percent favor the Democratic candidate or lean Democratic. A CNN poll also out Monday showed 46 percent of registered voters backing a Republican candidate on a generic congressional ballot, while 45 percent chose a Democrat.

DCCC PITCHING ROSIE: The Democratic Congressional Campaign Committee launched a new effort to woo unmarried women who are likely to vote Democratic, but expected not to vote during the midterms. The effort, titled Reengaging Our Sisters in Elections — or ROSIE, after the iconic feminist figure Rosie the Riveter — is part of a broader attempt to mitigate the turnout problems Democrats expect to face this fall.

PA-10 (OPEN): Former Secretary of State Hillary ClintonHillary Diane Rodham ClintonHouse Intel Republican: 'Foolish' not to take info on opponent from foreign ally House Intel Republican: 'Foolish' not to take info on opponent from foreign ally It's about the delegates, stupid MORE is making her first campaign stop of 2014 for her in-laws, attending a fundraiser for former Rep. Marjorie Margolies (D-Pa.), who is seeking a comeback for her old seat after two decades out of Congress. Chelsea Clinton is married to Margolies’s son.

WV-03 (RAHALL): Rep. Nick RahallNick Joe RahallWe shouldn't allow politics to impede disaster relief Break the cycle of partisanship with infant, child health care programs Clinton mulls role in 2018 midterms MORE (D-W.Va.) is using his latest ad to tout his record supporting the coal industry and to criticize outside spending against him.

2016 WATCH

A ROMNEY REDUX? Utah State Republican Party Chairman James Evans told the Deseret News that a group of Republicans in the state are launching an effort to draft 2012 GOP presidential nominee Mitt Romney into the 2016 race.

SANTORUM ENDORSES MIN. WAGE INCREASE: Former Pennsylvania Sen. Rick Santorum broke with his party and backed a hike in the minimum wage. "Let's not make this argument that we're for the blue collar guy but we're against any minimum wage hike ever," Santorum said. "It just makes no sense."

BIDEN TO S.C.: Vice President Joe BidenJoe BidenButtigieg on Biden's Iraq War vote: 'that vote was a mistake' Buttigieg on Biden's Iraq War vote: 'that vote was a mistake' Ocasio-Cortez starts petition to repeal Hyde Amendment MORE will headline a fundraiser for the South Carolina Democratic Party later this week, in a move likely to intensify speculation that he is preparing a run for the White House.

O’MALLEY BOTCHES AMA: Maryland Gov. Martin O’Malley (D) launched a Reddit "Ask Me Anything" thread on Monday and appeared to miss the point of the forum, answering even lighthearted questions from the notoriously tongue-in-cheek Redditors with humorless answers.