A statement by the Egyptian foreign ministry said the leaders will gather on Feb. 27 amid alarm in the region over President Trump's proposals regarding the future of Gaza.
The event was organized by Spain's Vox party in Madrid under the banner "Make Europe Great Again." The leaders applauded President Trump's agenda and spoke of the turning point it presented Europe.
The violin, made over 300 years ago by a legendary luthier, had been expected to sell for a higher price. The proceeds will go toward a scholarship program at the New England Conservatory.