Arlington House, The Robert E. Lee Memorial, formerly named the Custis-Lee Mansion, as seen from the flower garden, reopens to the public for the first time since 2018 at Arlington National Cemetery, Tuesday, June 8, 2021 in Arlington, Va. The Virginia mansion where Robert E. Lee once lived that now overlooks Arlington National Cemetery is open to the public again, after a $12 million rehabilitation and reinterpretation that includes an increased emphasis on those who were enslaved there. (AP Photo/Andrew Harnik)

The letter by Robert E. Lee resigning from the U.S. Army to join the south in the Civil War is displayed at a museum building at Arlington National Cemetery, Tuesday, June 8, 2021 in Arlington, Va. The Virginia mansion where Robert E. Lee once lived that now overlooks Arlington National Cemetery is open to the public again, after a $12 million rehabilitation and reinterpretation that includes an increased emphasis on those who were enslaved there. (AP Photo/Andrew Harnik)

A statue, photographs, and paintings of Robert E. Lee are displayed at a museum building at Arlington House, The Robert E. Lee Memorial, formerly named the Custis-Lee Mansion, which reopens to the public for the first time since 2018 at Arlington National Cemetery, Tuesday, June 8, 2021 in Arlington, Va. The Virginia mansion where Robert E. Lee once lived that now overlooks Arlington National Cemetery is open to the public again, after a $12 million rehabilitation and reinterpretation that includes an increased emphasis on those who were enslaved there. (AP Photo/Andrew Harnik)

The flower garden at Arlington House, The Robert E. Lee Memorial, formerly named the Custis-Lee Mansion, reopens to the public for the first time since 2018 at Arlington National Cemetery, Tuesday, June 8, 2021 in Arlington, Va. The Virginia mansion where Robert E. Lee once lived that now overlooks Arlington National Cemetery is open to the public again, after a $12 million rehabilitation and reinterpretation that includes an increased emphasis on those who were enslaved there. (AP Photo/Andrew Harnik)

Arlington House, The Robert E. Lee Memorial, formerly named the Custis-Lee Mansion, as seen from the flower garden, reopens to the public for the first time since 2018 at Arlington National Cemetery, Tuesday, June 8, 2021 in Arlington, Va. The Virginia mansion where Robert E. Lee once lived that now overlooks Arlington National Cemetery is open to the public again, after a $12 million rehabilitation and reinterpretation that includes an increased emphasis on those who were enslaved there. (AP Photo/Andrew Harnik)

Fruit trees are visible in the Kitchen Garden at Arlington House, The Robert E. Lee Memorial, formerly named the Custis-Lee Mansion, which reopens to the public for the first time since 2018 at Arlington National Cemetery, Tuesday, June 8, 2021 in Arlington, Va. The Virginia mansion where Robert E. Lee once lived that now overlooks Arlington National Cemetery is open to the public again, after a $12 million rehabilitation and reinterpretation that includes an increased emphasis on those who were enslaved there. (AP Photo/Andrew Harnik)

The flower garden at Arlington House, The Robert E. Lee Memorial, formerly named the Custis-Lee Mansion, reopens to the public for the first time since 2018 at Arlington National Cemetery, Tuesday, June 8, 2021 in Arlington, Va. The Virginia mansion where Robert E. Lee once lived that now overlooks Arlington National Cemetery is open to the public again, after a $12 million rehabilitation and reinterpretation that includes an increased emphasis on those who were enslaved there. (AP Photo/Andrew Harnik)

Personal belongings of Robert E. Lee are displayed at a museum building at Arlington House, The Robert E. Lee Memorial, formerly named the Custis-Lee Mansion, which reopens to the public for the first time since 2018 at Arlington National Cemetery, Tuesday, June 8, 2021 in Arlington, Va. The Virginia mansion where Robert E. Lee once lived that now overlooks Arlington National Cemetery is open to the public again, after a $12 million rehabilitation and reinterpretation that includes an increased emphasis on those who were enslaved there. (AP Photo/Andrew Harnik)

Arlington House, The Robert E. Lee Memorial, formerly named the Custis-Lee Mansion, as seen from the flower garden, reopens to the public for the first time since 2018 at Arlington National Cemetery, Tuesday, June 8, 2021 in Arlington, Va. The Virginia mansion where Robert E. Lee once lived that now overlooks Arlington National Cemetery is open to the public again, after a $12 million rehabilitation and reinterpretation that includes an increased emphasis on those who were enslaved there. (AP Photo/Andrew Harnik)

The letter by Robert E. Lee resigning from the U.S. Army to join the south in the Civil War is displayed at a museum building at Arlington House, The Robert E. Lee Memorial, formerly named the Custis-Lee Mansion, which reopens to the public for the first time since 2018 at Arlington National Cemetery, Tuesday, June 8, 2021 in Arlington, Va. The Virginia mansion where Robert E. Lee once lived that now overlooks Arlington National Cemetery is open to the public again, after a $12 million rehabilitation and reinterpretation that includes an increased emphasis on those who were enslaved there. (AP Photo/Andrew Harnik)