(Windsor)  --  President Biden and First Lady Jill Biden are receiving a formal welcome today at Windsor Castle.  Queen Elizabeth joined them in front of the castle for the ceremonial review of the troops and the playing of both countries national anthems.  The Bidens then had a private audience with the queen that included tea according to protocol.  President Biden is in the middle of a European tour that includes meetings with G7 and NATO countries with a final stop in Geneva where he will speak with Russian President Vladimir Putin.