National Republican Senatorial Committee (NRSC) Vice Chairman Rob PortmanRobert (Rob) Jones PortmanElection Countdown: O'Rourke brings in massive M haul | Deal on judges lets senators return to the trail | Hurricane puts Florida candidates in the spotlight | Adelson spending big to save GOP in midterms How Kavanaugh got the votes  Collins to support Kavanaugh, securing enough votes for confirmation MORE (Ohio) will headline a Capitol Hill fundraiser this month for Rep. Steve Daines (R-Mont.), according to an invitation for the event obtained by The Hill.

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The event is the latest sign that Daines is seriously considering a run for the Senate — and that national Republicans are hoping he'll mount a campaign.

Daines has been giving the race serious consideration ever since Sen. Max BaucusMax Sieben BaucusOvernight Defense: McCain honored in Capitol ceremony | Mattis extends border deployment | Trump to embark on four-country trip after midterms Congress gives McCain the highest honor Judge boots Green Party from Montana ballot in boost to Tester MORE (D-Mont.) announced his retirement in late April, and Montana Republicans say they see him as their most likely standard-bearer for the seat.

The freshman lawmaker has picked up his fundraising pace significantly since Baucus’s announcement.

Daines raised $430,000 in the last three months, a big jump from the $250,000 he brought in during the first three months of the year. Those are impressive numbers for a House member representing a safe seat — and an indication that he’s readying a possible Senate bid.

Portman, the NRSC’s vice chairman in charge of fundraising, has deep connections with the party’s donor base and will likely help Daines further swell his campaign war chest.

The fundraiser is scheduled for July 17 on the Senate side of Capitol Hill. Donations are set at $500 per person and $1,000 per political action committee to attend, while hosts pay $2,500.

The race for Montana’s open seat will be crucial in the battle for Senate control. 

Democrats are hoping former Montana Gov. Brian Schweitzer (D) runs. Early polling shows a tight race between Schweitzer and Daines if both jump in.