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When Democrats gather next week to crown Hillary ClintonHillary Diane Rodham ClintonWoman behind pro-Trump Facebook page denies being influenced by Russians Trump: CNN, MSNBC 'got scammed' into covering Russian-organized rally Pennsylvania Democrats set to win big with new district map MORE as their presidential nominee, some of the party's top Senate challengers won't be there. 

A handful of Senate Democratic hopefuls are planning to skip the convention because of conflicting schedules or to campaign in their home states.

Campaigns for Rep. Ann KirkpatrickAnn KirkpatrickGold Star father attacked by Trump steps up role in Dem primaries House Dems highlight promising new candidates Vulnerable House incumbents build up war chests MORE (D-Ariz.), former Nevada Attorney General Catherine Cortez Masto and former Sen. Russ Feingold (D-Wis.) confirmed to The Hill that the candidates won't attend the Democratic National Convention in Philadelphia.

The three Democratic hopefuls are in competitive Senate races that could determine which party controls the upper chamber next year. Democrats needs to pick up five Senate seats — four if they keep the presidency — to win the majority.

Both Kirkpatrick and Cortez Masto are expected to use the week to campaign. Sen. John McCainJohn Sidney McCainLawmakers worry about rise of fake video technology Democrats put Dreamers and their party in danger by playing hardball Trump set a good defense budget, but here is how to make it better MORE (R-Ariz.), whom Kirkpatrick will likely face off against in November, also skipped his party's convention this week in Cleveland. 

Feingold said last month that he never intended to attend the party's convention. 

"I just don't usually spent a lot of time at national conventions if I'm running because there is much more to be done here in the state," he said during a campaign stop, according to the Milwaukee Journal Sentinel. "It's just because I believe we're working on a grass-roots campaign."

Meanwhile, Jason Kander, a Democrat running to unseat Sen. Roy BluntRoy Dean BluntRussian assault on 'American idea' enables Trump to take tough action Eleven lawmakers have used campaign funds to pay NRA dues: report Kimmel writer tweets amount NRA has given lawmakers in response to shooting prayers MORE (R-Mo.), is also skipping the party powwow citing a scheduling conflict. 

"Due to the number of events we have in Missouri next week, Jason won't be able to make it to the convention," Anne Feldman, a spokeswoman for Kander's campaign said in a statement Tuesday. "He was looking forward to supporting Missouri's delegates in Philadelphia but will make sure to catch up with them when they come home." 

Republicans quickly pounced on the announcement, hinting that it was tied to a recent Public Policy Polling (PPP) poll that found Clinton trailing her Republican rival, Donald TrumpDonald John TrumpAccuser says Trump should be afraid of the truth Woman behind pro-Trump Facebook page denies being influenced by Russians Shulkin says he has White House approval to root out 'subversion' at VA MORE, by 10 percentage points in the state. 

But Feldman added Tuesday that Kander's missing the convention was "purely a scheduling decision." 

"Jason attended an event with Secretary Clinton in St. Louis just last week and looks forward to her fighting for Missouri's 10 electoral votes this fall," she added. 

On the GOP side, most endangered 2016 incumbents have also chosen to stay away from Cleveland this week as the party prepares to formally nominate Trump. 

Other Democratic candidates are heading to Philadelphia, but their campaigns warned they won't be at the convention for the entire week. 

Former Iowa Lt. Gov. Patty Judge, who is facing Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleyPavlich: The claim Trump let the mentally ill get guns is a lie Congress fails miserably: For Asian-Americans, immigration proposals are personal attacks Grassley, Dems step up battle over judicial nominees MORE (R-Iowa), is expected to attend part of the convention. 

North Carolina Democratic hopeful Deborah Ross's campaign told The Hill on Monday afternoon that it looked as if she would be at the convention for one day, but her schedule wasn't final.

Not all of the party's top Senate recruits will be missing from Clinton's coronation.

Campaigns for Rep. Tammy Duckworth (D-Ill.), New Hampshire Gov. Maggie Hassan, former Ohio Gov. Ted Strickland and Pennsylvania Democrat Katie McGinty told The Hill that the candidates will be in Philadelphia next week.