When Democrats gather next week to crown Hillary ClintonHillary Diane Rodham ClintonAmerica departs Afghanistan as China arrives Young, diverse voters fueled Biden victory over Trump McConnell: Taliban could take over Afghanistan by 'the end of the year' 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.

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Campaigns for Rep. Ann KirkpatrickAnn KirkpatrickDemocrats confront difficult prospects for midterms Surgeon who treated Gabby Giffords after shooting launches House bid in Arizona These House lawmakers aren't seeking reelection in 2022 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 McCainEx-McSally aide pleads guilty to stealing over 0K in campaign funds DOJ: Arizona recount could violate civil rights laws Cheney fight stokes cries of GOP double standard for women 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 BluntTop female GOP senator compares Cheney ousting to 'cancel culture' House conservatives take aim at Schumer-led bipartisan China bill Biden to meet with GOP senators amid infrastructure push 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 TrumpCaitlyn Jenner says election was not 'stolen,' calls Biden 'our president' Overnight Health Care: FDA authorizes Pfizer vaccine for adolescents | Biden administration reverses limits on LGBTQ health protections Overnight Defense: US fires 30 warning shots at Iranian boats | Kabul attack heightens fears of Afghan women's fates | Democratic Party leaders push Biden on rejoining Iran deal 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 GrassleyChuck GrassleyOn The Money: Biden says workers can't turn down job and get benefits | Treasury launches state and local aid | Businesses jump into vax push Grassley criticizes Biden's proposal to provide IRS with B The Hill's Morning Report - Presented by Facebook - Infrastructure, Cheney ouster on deck as Congress returns 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.