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 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.). 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 McCainGOP rushes to cut ties to Moore GOP strategist: 'There needs to be a repudiation' of Roy Moore by Republicans World leaders reach agreement on trade deal without United States: report 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 BoehnerThe two-party system is dying — let’s put it out of its misery One year later, neither party can get past last year's election White House strikes back at Bushes over legacy 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 BegichPerez creates advisory team for DNC transition The future of the Arctic 2016’s battle for the Senate: A shifting map 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 FrankenOvernight Tech: Senate panel subpoenaed ex-Yahoo chief | Twitter gives all users 280 characters | FBI can't access Texas shooter's phone | EU wants tax answers from Apple Week ahead: DHS nominee heads before Senate | Ex-Yahoo chief to testify on hack | Senators dig into election security Feinstein: Sessions should re-testify on Russia meetings 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 CochranWhite House requests B for missile defense to counter North Korea Senate narrowly passes 2018 budget, paving way for tax reform Live coverage: The Senate's 2018 budget 'vote-a-rama' 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 ShaheenDefense bill includes 3,500 more visas for Afghans who helped US troops Overnight Finance: Day three of tax bill markup | Ryan says election results raise pressure for tax reform | Tax whip list - Where Republicans stand | Justice, AT&T spar over CNN sale | 25 Dems vow to block spending without Dream Act Russia crackdown survives NDAA conference 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 AlexanderObamaCare becomes political weapon for Democrats Senate passes resolution requiring mandatory sexual harassment training Sen. Warren sold out the DNC MORE (R-Tenn.), filed his personal financial disclosure forms months after his August entry into the race.

WV-SEN (MANCHIN): Sen. Joe ManchinJoseph (Joe) ManchinDems mull big changes after Brazile bombshell A bipartisan bridge opens between the House and Senate Collins, Manchin to serve as No Labels co-chairs 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 ClintonGOP rushes to cut ties to Moore Papadopoulos was in regular contact with Stephen Miller, helped edit Trump speech: report Bannon jokes Clinton got her ‘ass kicked’ in 2016 election 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 RahallLikely W.Va. Senate GOP rivals spar in radio appearances West Virginia is no longer Clinton country Solution needed: Rail congestion is stifling economic growth 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 BidenJoseph (Joe) Robinette BidenThe Hill's 12:30 Report Pence talks regularly to Biden, Cheney: report Biden moving toward 2020 presidential run: report 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.