Tokyo is on high alert for U.S. President Donald Trump's three-day visit that began Monday, with authorities particularly vigilant against possible sniper and so-called lone wolf attacks.Tokyo Metropolitan Police Department said it has mobilized up to 18,000 officers and is stepping up questioning of suspicious individuals.Security measures are considered all the more vital following the assassination attempt on Trump in July last year, when he was fired upon from a rooftop during an outdoor campaign event, and the fatal shooting of former Prime Minister Shinzo Abe during a stump speech in …READ FULL ARTICLE