Washington (CNN)Text messages released on Thursday between US diplomats and a senior Ukrainian aide show how a potential Ukrainian investigation into the 2016 election was linked to a desired meeting between Ukrainian President Volodymyr Zelensky and US President Donald Trump. The text messages, which were released by the House Intelligence Committee, underscore how Trump's personal attorney, Rudy Giuliani, was closely connected to US policy on Ukraine and was involved in setting up the July 25 phone call between Trump and Zelensky, in which Trump also urged an investigation into former Vice President Joe Biden and his son, Hunter Biden. They...