Trump unveils design of $273 billion Golden Dome shield to protect US from Russia and China

US President Donald Trump has selected a design for the Golden Dome missile defence shield and has named a Space Force general to head the ambitious program aimed at blocking threats from China and Russia. Trump announced on Tuesday at a White House press conference that US Space Force General Michael Guetlein would be the lead program manager for what the president said would be a $US175 billion ($A273 billion) project, an effort widely viewed as the keystone to Trump's military planning. Golden Dome will "protect our homeland", Trump said from the Oval Office and added that Canada had said…