Queen Elizabeth II in London

First lady Jill Biden is overwhelmed by the outpouring of love and respect she is witnessing for Queen Elizabeth IIduring her visit to London with President Joe Biden, especially the viewing of the Queen's coffin at Westminster Hall, she said on Sunday.

"It was really moving. We walked in there, Joe and I, near the coffin, the mourners were filing past," Biden said in a phone interview.

The first lady said she witnessed a young boy in a Boy Scout uniform walk past the coffin. "He put up his three fingers and he gave the Queen a final salute, and just seeing  that gave me a lump in my throat," she recalled.

Biden added she could feel the deep emotional toll the Queen's death has had on the people of the United Kingdom, noting that the "thousands and thousands" of people queuing to pay their respects was "an amazing sight.