President Donald Trump says Washington will host a massive rally on 24 June to mark America’s 250th anniversary, after planned concerts were scrapped when several performers withdrew. "In celebration of our Country's 250 Year History, we will be bringing you, LIVE, the Greatest Rally, EVER! It will be special at every level - A Rally to end all Rallies!" Mr Trump said on his Truth Social network. "We don't want singers with no talent, but big fees to put you to sleep, we've told them all to stay home," added the 79-year-old…