German Labour Minister Hubertus Heil on Saturday said he believes the US presidential election is “not over yet,” as he travelled to Washington for talks with political leaders and NASA. Heil is the first German minister to visit the United States since President Joe Biden’s disastrous performance in a June TV debate with former president Donald Trump, who is seen as the front-runner in November’s election after surviving an assassination attempt last week. The minister refused to be drawn on whether Biden should withdraw his candidacy or seek a second term in office, after weeks of difficult …