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Iowa's state Republican Party committee voted this weekend to move the party convention from mid-June to mid-July. Insiders are worried that could hurt the party's eventual Senate nominee by limiting his or her time to fundraise and mobilize supporters ahead of the general election.

Democrats have rallied around Rep. Bruce BraleyBruce Lowell BraleyOPINION | Tax reform, not Trump-McConnell feuds, will make 2018 a win for GOP Ten years later, House Dems reunite and look forward Trump: Ernst wanted 'more seasoning' before entertaining VP offer MORE as their pick to replace retiring Sen. Tom HarkinThomas (Tom) Richard HarkinDem Senator open to bid from the left in 2020 Senate GOP rejects Trump’s call to go big on gun legislation Trump should require federal contractors to follow the law MORE (D-Iowa), and he's building a large war chest as a crowded GOP field of candidates fights for resources.

Iowa Gov. Terry Branstad (R) tells the Des Moines Register the move is "a real mistake" and calls on the state committee to reconsider the move, while Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleyFlake threatens to limit Trump court nominees: report On The Money — Sponsored by Prudential — Markets roiled by Trump's new tariff threat | Trump lashes out at Canada over trade | Warren looks to block Trump pick for consumer agency The Hill's Morning Report — Sponsored by PhRMA — Defiant Trump meets with House GOP amid border blowback MORE (R-Iowa) tells the paper he agrees with the governor. Three of the four GOP Senate candidates in the race concurred.

The move is unlikely to matter: If one of the candidates can win 35 percent in the early June primary, they'll be the nominee. But if no candidate hits that mark the nominee will be chosen in the state party convention, a prospect that is worrying many establishment Republicans in the state.