text: "We will not allow Trump's continued obstruction to stop us from delivering the truth to the American people," Nadler said. Meanwhile the Democratic heads of three other House committees announced an investigation into alleged efforts by Trump and his lawyer Rudy Giuliani to pressure the Ukrainian government for their own political ends, including by withholding US security assistance.
  They allege that Trump and Giuliani have pressured Kiev to prosecute Ukrainians who provided evidence against Trump's former campaign manager Paul Manafort in the Russia meddling investigation.
  They also alleged that Kiev was pressured to provide damaging information on the son of former Democratic vice president Joe Biden, who could face Trump in next year's presidential election. Hunter Biden worked for a Ukrainian gas company beginning in 2014, while his father was vice president.