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The officials are set to answer questions at the Louisville, Kentucky event.
Republican leaders want to start moving tax reform legislation through Congress when lawmakers return from their August recess. They hope to pass a bill by the end of the year — a potentially tall order as they face a packed legislative schedule and confusion in the White House.
Mnuchin has faced pressure to step down following President Donald Trump's divisive response to violence at a white supremacist rally in Charlottesville, Virginia. Urged by hundreds of Yale classmates to resign, Mnuchin on Saturday condemned the white supremacists and said they do not have any defense "from the president or this administration."
"I don't believe the allegations against the president are accurate, and I believe that having highly talented men and women in our country surrounding the president in his administration should be reassuring to you and all the American people," he said in a statement.
Trump's response to Charlottesville and his public feuds with McConnell and other senators have led some observers to conclude that Congress may shrug off the president's demands during the tax reform process.