Grassley will be a "special guest" at two fundraisers for David Young (R), who was his chief of staff until late May, according to invitations obtained by the Des Moines Register.
The move likely pits Grassley against Iowa Gov. Terry Branstad (R) in the Iowa Senate primary, as Branstad has quietly pushed Iowa state Sen. Joni Ernst (R) to run for the seat.
Both men have been careful to stay publicly neutral in the race to replace retiring Sen. Tom HarkinTom HarkinDo candidates care about our health or just how much it costs? The Hill's 12:30 Report Mark Mellman: Parsing the primary processes MORE (D-Iowa), but as the race heats up, it will be interesting to see how involved each gets for their preferred candidate. Former U.S. Attorney Matt Whitaker (R) is also in the race.