Vice President Biden will be the keynote speaker at Sen. Tom HarkinThomas (Tom) Richard HarkinOn Nicaragua, the silence of the left is deafening Dem Senator open to bid from the left in 2020 Senate GOP rejects Trump’s call to go big on gun legislation 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 ClintonPompeo: 'We've not been successful' in changing US-Russia relations Michael Moore ties Obama to Trump's win in Michigan in 2016 The Memo: Could Kavanaugh furor spark another ‘year of the woman’? MORE, who has not said whether she will consider a 2016 run, the early Democratic favorite.