How many White House staffers only have partial security clearance?

FBI Director Christopher Wray on Tuesday contradicted the White House’s claim that Rob Porter’s background check wasn’t complete. Porter stepped down as President Trump’s staff secretary last week following news that his two ex-wives and a former girlfriend accused him of domestic violence. We learn why Porter - plus Trump’s son-in-law Jared Kushner - were granted only temporary security clearance, and what the whole vetting process entails.