President Donald Trump has started paying his own legal bills related to the Russia probe, rather than charging them to his campaign or the Republican National Committee, and is finalizing a plan to use personal funds to help current and former White House staff with their legal costs.

The Office of Government Ethics and a tax firm are working on a mechanism for Trump to contribute to staffers’ legal bills that would meet regulatory and ethical standards, White House lawyer Ty Cobb said in an interview. The White House is hoping the issue will be resolved shortly, said Cobb, who declined to elaborate further on the details of the plan.

While there is no law barring a president from giving gifts to those who report to him, Trump’s case raises unique questions about whether his contributions could influence the testimony of staffers, said Walter Shaub, former head of the Office of Government Ethics who has criticized the president over other conflicts of interest.