Christie: Obstruction of justice charges are hard to prove

New Jersey Republican Gov. Chris Christie says it takes “very significant evidence” to prove obstruction of justice and that facts surrounding President Donald Trump and an investigation involving Russia are still unknown.

Christie commented on the latest revelations Wednesday in Newark.

Christie, a former U.S. attorney for New Jersey, says he’s prosecuted and won obstruction of justice cases and that they’re “very difficult” to prove.

Christie is leading a White House commission on opioids and is the Republican president’s friend of 15 years.

The comments come as the administration denies reports that Trump pressed fired FBI Director James Comey to drop an investigation into Trump’s first national security adviser, Michael Flynn.

Trump is also facing questions about discussions with Russian diplomats when he was reported to have disclosed classified information.