Washington Post: Giuliani sought $200K contract from Ukraine prosecutor while pushing him for Biden investigation; New York Times: Trump briefed on whistleblower report before releasing Ukraine aid, undermining White House defense; Impeachment could complicate 2020 picture for Trump; Trump makes impeachment focal point of campaign; Multiple large explosions rattle Texas chemical plant; Poll: Biden holds strong lead over Democratic field; Poll: Sanders holding strong in crowded field; Putin polishes strongman image in new calendar via Knit