Treasury Secretary Steven Mnuchin sat before the House Financial Services Committee on Wednesday to face a group of Democrats who want President Trump's tax returns. The House Ways and Means Committee recently issued a subpoena for six years of returns, which the administration rejected. Mnuchin's letter to the Democrats concluded that their request "lacks a legitimate legislative purpose." A federal judge upheld the subpoena, but it was perhaps no surprise considering he was appointed by President Obama. Additionally, the chief counsel's office drafted an IRS memo noting that chairmen of congressional committees don't need "a legitimate legislative purpose" for requesting...