A financial consultant who performed contract work for the IRS pleaded guilty Thursday to leaking reams of confidential tax returns filed by the wealthiest Americans, including those of then-President Donald Trump. Charles Edward Littlejohn, 38, admitted in D.C. federal court that he obtained thousands of individuals’ tax returns by accessing an IRS database, and then leaked the materials to the New York Times and ProPublica beginning in 2019. The news organizations published blockbuster reports based on the trove of data, showing how Trump and the wealthiest Americans employed financial strategies to slash their federal tax bills, in some cases down...