An ally of Jeb Bush, a likely Republican presidential candidate, has created a tax-exempt organization that would be closely intertwined with Bush’s political operation. The group would serve as a policy hub for the campaign, its founder said. (Randall Hill/Reuters)

Jeb Bush has given his tacit endorsement to a new group that can collect unlimited amounts of money in secret, part of a bold effort by his advisers to create a robust external political operation before he declares his expected White House bid.

The nonprofit group, Right to Rise Policy Solutions, was quietly established in Arkansas in February by a friend and former Bush staffer. The group shares the name of two political committees for which Bush has been aggressively raising money — blurring the line that is supposed to separate a campaign from independent groups.

While ideological nonprofits have become major players in national politics in recent years, this marks the first time one has been so embedded in the network of a prospective candidate.

An individual donor can give no more than $5,400 to a presidential campaign. Individuals and corporations can give unlimited sums to super PACs, and their names are publicly reported. But with the new Right to Rise group, individuals and corporations can give as much as they want while remaining anonymous.

Election-law experts predict that the creation of the ­Bush-allied nonprofit will prompt other 2016 contenders to adopt the strategy, injecting more secret money into the political process.

“If it looks like a good idea, others are going to copy it in short order,” said Kenneth Gross, a Washington campaign finance lawyer and former associate general counsel of the Federal Election Commission.

Supporters of stricter enforcement of campaign finance rules said the move raises serious legal questions, such as whether the group could later be considered affiliated with the eventual campaign or viewed as an entity established by Bush. But other legal experts said the operation could be designed to avoid those pitfalls.

Aides to Bush, a former Florida governor, declined to comment on the new group.

“These questions are premature and speculative as Governor Bush is not a candidate for office at this time,” said his spokeswoman, Kristy Campbell.

In early February, Bill Simon, a former chief executive of Wal-Mart, formed Right to Rise Policy Solutions as a nonprofit corporation in his home state of Arkansas, according to public records. Simon served as head of Florida’s Department of Management Services during Bush’s second term as governor, and the two remain close. In recent months Simon has been helping Bush develop policy positions and identifying potential experts to eventually join the campaign.

Simon told The Washington Post in an e-mail that he established the group “to highlight conservative policies that will restore economic and social mobility in America. The organization will be engaged in policy generation that is consistent with Governor Bush’s optimistic, conservative message and vision for the future of America.”

Simon said he plans to launch a Web site “that will highlight conservative, reform-minded policies.” The group will make the content available publicly online. That would allow the nonprofit to share information with Bush’s campaign and super PAC without running afoul of tax rules, which restrict its political activity.

Simon stressed that the group will “comply with all applicable IRS regulations.” While it can accept unlimited donations, he added, the nonprofit “is a policy group. Not a political or fundraising group.”

The group’s role as a policy hub raises questions about who would be guiding Bush’s policies — an in-house team or an outside operation. Simon didn’t respond to follow-up questions about the scope of his new group, including the level of Bush’s involvement or if the group plans to disclose the names of its donors.

A person familiar with the new organization, who was not authorized to talk publicly and so spoke on the condition of anonymity, said, “There is nothing wrong with a friend establishing a group to advance policy issues that he’s passionate about.”

This person added that there are no plans for the group to spend money on “paid political advocacy” of any kind on television, radio, online or through mailers.

The organization could still boost Bush through other indirect means, such as voter-registration or field efforts.

Bush’s legal team has responded aggressively to unsanctioned political efforts. When a supporter in Florida began running an unapproved radio ad in February touting Bush for president, he received a cease-and-desist letter from a Bush PAC lawyer.

The creation of a tax-exempt organization closely intertwined with Bush’s political operation suggests that voters may not have a complete picture of who will be financing the efforts to elect him president.

“We generally will know who the millionaires are chipping into the super PAC,” said Craig Holman, government affairs lobbyist for the group Public Citizen, which advocates for greater disclosure of political financing. “But this is going to be an avenue for dark money.”

Offering a tacit blessing to such an outfit could undermine Bush’s efforts to portray himself as a transparent, reform-minded leader. He has tried to bolster that image by publishing tens of thousands of e-mails that he sent from his personal account as governor.

Bush is not the first presidential contender to have an allied tax-exempt organization. A super PAC set up to back President Obama in 2012 had a smaller nonprofit arm, Priorities USA, that ended up giving most of its money away to groups such as Planned Parenthood and Hurricane Sandy relief efforts, according to tax documents. That nonprofit has been disbanded, but the super PAC, Priorities USA Action, is poised to support expected Democratic contender Hillary Rodham Clinton in the coming White House race.

Other likely Republican candidates — including former Arkansas governor Mike Huckabee, former Texas governor Rick Perry, Louisiana Gov. Bobby Jindal and former senator Rick Santorum (Pa.) — have their own allied nonprofits.

But Bush’s advisers appear to have gone much further by outsourcing a specific function to a tax-exempt group.

Such “social welfare” groups, formed under Section 501(c)(4) of the tax code, have proliferated in campaigns since the Supreme Court’s 2010 Citizens United decision, which allowed corporations and unions to spend money directly on politics.

The 2014 congressional elections saw a new iteration of such organizations: social welfare groups closely aligned with a single candidate. The most prominent example was the Kentucky Opportunity Coalition, a 501(c)(4) that reported spending more than $7.5 million on behalf of Senate Majority Leader Mitch McConnell (R). The group’s strategist, a Kentucky-based Republican operative named Scott Jennings, has joined Bush’s PAC and is expected to serve as his campaign’s political director.

Another top Bush strategist, election-law attorney Charlie Spies, helped set up a similar nonprofit in Oklahoma in 2014 that spent nearly $1.3 million on behalf of Senate candidate T.W. Shannon.

Campaign finance experts said the nonprofit will draw questions about whether Bush or his agent could be found to have established the group. That could violate the McCain-Feingold Act, which bans candidates from creating groups that raise money outside federal contribution limits.

If Bush effectively set up the group, “I have a hard time envisioning how the (c)(4) could operate lawfully,” said Paul S. Ryan, senior counsel at the Campaign Legal Center.

But Anthony Herman, a former general counsel of the FEC, said that if the group was set up carefully, it could skirt such legal questions.

“I am certain, with the level of sophistication of these political operatives, they will steer comfortably around the FEC,” Herman said. “It is very, very cleverly designed.”

The close proximity between prospective candidates such as Bush and groups that would function as their outside allies has alarmed advocates of stricter campaign finance regulation. On Tuesday, the Campaign Legal Center and Democracy 21 filed complaints with the FEC against Bush, Santorum, former Maryland governor Martin O’Malley (D) and Wisconsin Gov. Scott Walker (R), alleging that they have met the definition of a candidate and are violating contribution limits, among other rules.

As he has traveled the country in recent weeks to meet with Republicans, Bush has often begun his speeches by maintaining that he’s not officially a presidential candidate. But, he adds with a shrug, he is dwelling on the “possibility of considering the possibility of running.”