Vice President Biden will be the keynote speaker at Sen. Tom HarkinThomas (Tom) Richard HarkinStop asking parents to sacrifice Social Security benefits for paid family leave The FDA crackdown on dietary supplements is inadequate Wisconsin lawmaker refuses to cut hair until sign-language bill passes 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 ClintonDemocratic Socialists of America endorses Sanders for president How to end the Electoral College and elect our next president by popular vote CNN town halls put network at center of Dem primary MORE, who has not said whether she will consider a 2016 run, the early Democratic favorite.