US President Donald Trump on Thursday deployed his trademark blend of crude humour and Twitter to mock potential election rival Joe Biden’s apology for having touched women without permission. Biden, an undeclared hopeful for the Democratic nomination to take on Trump in 2020, earlier tweeted a short video earlier in which he promised to respect “personal space” more in the future. WELCOME BACK JOE! pic.twitter.com/b2NbBSX3sx — Donald J. Trump (@realDonaldTrump) April 4, 2019 <!--//--><![CDATA[// ><!--\n\n\n//--><!]]> Trump responded by posting a doctored version of the video in which an image of Biden creeps up behind the actual Biden and puts his hands on his shoulders. “WELCOME BACK JOE!” Trump wrote in the message. The president also pinned the message at the top of his Twitter page. The joking tweet is in keeping with Trump’s history of mocking opponents with sexual innuendo, school playground-style nicknames, and torrents of tweets. In September 2017, he retweeted a video splicing footage of him hitting a golf ball and former 2016 presidential opponent Hillary Clinton falling over, so it seemed she was knocked down by his ball. Biden, 76, defended himself over instances where he kissed women on the head or put hands on them, suggesting he was merely affectionate and politics is about “making connections”. But in the video he insisted he would be “more mindful about respecting personal space in the future”. Donald Trump’s Twitter use is ‘liberating’, Rupert Murdoch has ‘less influence’, says ex-PM Malcolm Turnbull Biden has not declared officially but polls show the former vice-president under Barack Obama and long-time senator would be a strong challenger to Trump. He responded to Trump’s mockery with another tweet: “I see that you are on the job and presidential, as always.” Trump faces a litany of far more serious allegations about his behaviour around women, including multiple affairs, and claims of rape, groping and harassment that he has dismissed. Tracking Trump’s tangled trade war tweets Just before the 2016 election a decade-old recording was released in which Trump could be heard boasting about “grabbing” women’s genitals. Trump said he was “not proud” of his words but they were just “locker room talk”.