The demand is part of the White House's aggressive new strategy to combat the threat posed by special counsel Robert Mueller's ongoing investigation into the Russia probe.
The British singer posted a message on Instagram along with a photo of herself wearing a veil and toasting with a glass of champagne.
Footage from the US Geological Survey shows fresher magma moving as it mixed with decades-old magma.
The reception at nearby Frogmore House was hosted by Harry's father Charles, the Prince of Wales.
Prince Harry and Meghan Markle gazed into each other's eyes and pledged their eternal love this morning, as they married at St George's Chapel.