Fredreka Schouten

USA TODAY

The legal mind behind Jeb Bush's super PAC fired another shot against Donald Trump on Wednesday, lodging a second complaint with federal regulators that the billionaire has improperly used corporate resources to advance his presidential ambitions.

Under federal law, corporations cannot contribute money or in-kind services directly to federal candidates.

Charles Spies, who represents the pro-Bush Right to Rise super PAC, points out that one of Trump's corporate lawyers, Michael Cohen, recently told CNN that he would "send a letter very soon on behalf of Mr. Trump" to the person responsible for including a clip of Morocco instead of Mexico in the billionaire's first campaign ad.

"Cohen is not the campaign's attorney or paid by the campaign," Spies wrote. "He is employed solely by the Trump Organization."

"Trump's misuse of his company's corporate employees and resources to defend and aid his political candidacy has rendered the organization and the campaign as virtually indistinguishable entities," Spies added. "It is remarkable that a candidate fixated on erecting walls refuses to establish any semblance of a wall between his company and his presidential campaign."

Trump officials did not immediately respond to a request for comment.

Election lawyers have warned that Trump appears to be crossing the line. Spies last month filed a complaint about the issue with the Federal Election Commission, citing repeated threats by a Trump corporate lawyer to sue political rivals who run negative ads about the front-running Republican candidate.

Donald Trump's candidacy raises novel ethics questions

The commission, which often deadlocks 3-3 along partisan lines, usually does not act on enforcement matters until long after an election. In the past, Trump's camp has defiantly refused to change its practices, saying the corporate lawyers are defending Trump's business brand.