Rudy Giuliani has been subpoenaed by the House Intelligence Committee to produce documents by Oct. 15 related to his and President Trump's alleged efforts to push the government of Ukraine to investigate Joe Biden. Over the past year, Giuliani has met with a variety of Ukrainian officials in an effort to investigate baseless allegations that Biden forced Ukraine to fire a prosecutor investigating his son, Hunter. In a July phone call that is now at the heart of House Democrats' impeachment inquiry, Trump asked Ukraine's president to work with Giuliani to investigate Biden — prompting allegations by a whistleblower that Trump was soliciting foreign interference in the 2020 election.