This Saturday, April 28, 2018, photo shows an empty area where a tree was planted by U.S. President Donald Trump and French President Emmanuel Macron during a tree planting ceremony on the South Lawn of the White House in Washington. The young ceremonial tree was planted in the area between the light pole at left and the tree at right. (AP Photo/Carolyn Kaster)

This Saturday, April 28, 2018, photo shows an empty area where a tree was planted by U.S. President Donald Trump and French President Emmanuel Macron during a tree planting ceremony on the South Lawn of the White House in Washington. The young ceremonial tree was planted in the area between the light pole at left and the tree at right. (AP Photo/Carolyn Kaster)

WASHINGTON (AP) — A mystery is brewing at the White House about what happened to the oak tree President Donald Trump and French President Emmanuel Macron planted there last week.

The sapling was a gift from Macron on the occasion of his state visit.

News photographers snapped away Monday when Trump and Macron shoveled dirt onto the tree during a ceremonial planting on the South Lawn. By the end of the week, the tree was gone from the lawn. A pale patch of grass was left in its place.

The White House hasn’t offered an explanation.

The oak sprouted at a World War I battle site that became part of U.S. Marine Corps legend.

About 2,000 U.S. troops died in the June 1918 Battle of Belleau Wood, fighting a German offensive.