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US President Donald Trump waves as he walks towards Marine One while departing the White House on May 17, 2017 in Washington, DC en route to Connecticut. / AFP PHOTO / Olivier Douliery        (Photo credit should read OLIVIER DOULIERY/AFP/Getty Images)
US President Donald Trump waves as he walks towards Marine One while departing the White House on May 17, 2017 in Washington, DC en route to Connecticut. / AFP PHOTO / Olivier Douliery        (Photo credit should read OLIVIER DOULIERY/AFP/Getty Images)

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    Obstruction of justice difficult to prove

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Obstruction of justice difficult to prove

CNN's Brian Todd reports on the difficulties in proving an obstruction of justice charge and bringing articles of impeachment against a sitting US president.

Obstruction of justice difficult to prove

CNN's Brian Todd reports on the difficulties in proving an obstruction of justice charge and bringing articles of impeachment against a sitting US president.