GOP lawmakers have vowed to end the committee's quest to obtain the records and a related probe into how the Internal Revenue Service audits the tax returns of sitting presidents.The Ways and Means Committee in April 2019 first asked the Treasury Department for the federal income tax returns of Trump and of the Donald J. Trump Revocable Trust, along with those of seven limited liability companies connected to the ex-president, one of which does business as Trump National Golf Club in Bedminster, New Jersey.But then-Treasury Secretary Steven Mnuchin, who was appointed by Trump, refused to comply with the request for his tax returns, saying that the committee lacked a legitimate legislative purpose.Neal said that the committee, in addition to reviewing how tax laws apply to presidents, also would review potential conflicts of interest by a president.Trump then countersued to block the returns from being turned over, arguing that the request both violated the constitutional separation of powers between the executive and legislative branches of government and that the request did not have a legitimate purpose."