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Donald Trump waves as he departs a campaign rally on April 25 in Warwick, R.I. | AP Photo Super PAC to mount pro-Trump charge in California

A pro-Donald Trump super PAC is gearing up to invest big in California, a state that doles out more delegates than any other in the Republican nomination fight.

In a memo to its donors on Monday, Great America PAC, says it will begin polling in all of California's 53 congressional districts later this week to determine where to invest.

California Republicans will lay out 172 delegates when they vote on June 7, and many of the delegates will be allocated based on results at the congressional district level.

Great America PAC has emerged the leading pro-Trump super PAC. While the New York businessman has made opposition to outside groups a centerpiece of his campaign, Great America PAC has pushed forward, tapping seasoned operatives Jesse Benton and Eric Beach to oversee its efforts.

The memo also seeks to assuage concerns about Trump's finance operation. With questions lingering about whether Trump is building a sufficient fundraising infrastructure for a prospective general election matchup with Hillary Clinton, Great America PAC bills itself as a burgeoning financial powerhouse.

"Perhaps most importantly, Trump campaign leadership knows they need a grassroots finance operation to take on Hillary, and yet have not built that infrastructure," the memo says. "Great America PAC has, building a robust national grassroots finance operation, poised to fill that void for the Trump going into, and coming out of, the convention."