Vice President Biden will be the keynote speaker at Sen. Tom HarkinThomas (Tom) Richard HarkinWisconsin lawmaker gets buzz-cut after vowing not to cut hair until sign language bill passed Democratic debates kick off Iowa summer sprint Key endorsements: A who's who in early states MORE’s (D-Iowa) steak fry fundraiser in September, according to reports.

“It has been a long-standing commitment after the Vice President was unable to attend last year,” a representative for Biden told The Des Moines Register.

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Harkin’s annual steak fry, which will be held Sept. 15, is one of Iowa’s marquee Democratic events and a past stop for many potential presidential contenders. 

San Antonio Mayor Julian Castro will also speak at the fundraiser.

Biden has declined to rule out a 2016 presidential run and has made a number of visits to early-voting states. 

The vice president visited Iowa in January and South Carolina in May. Later this month he will attend a fundraiser for New Hampshire Gov. Maggie Hassan (D) in neighboring Maine. 

Polls show former Secretary of State Hillary ClintonHillary Diane Rodham ClintonTrump takes aim at media after 'hereby' ordering US businesses out of China Trump knocks news of CNN hiring ex-FBI official McCabe Taylor Swift says Trump is 'gaslighting the American public' MORE, who has not said whether she will consider a 2016 run, the early Democratic favorite.