The  Harvard-Harris Poll says 45%.  

"He is holding on to 90 percent of his voters and his ratings are still above approval ratings for both the Democratic and Republican parties,” Penn said."

Comey's rating was lower than Trump's!

"According to the poll whose results were released to the Hill, 60 percent of voters disapproved of Comey’s job at the bureau compared to 40 percent who approved it."

"The poll also found 59 percent of voters believed that Trump indeed asked Comey to put an end to the probe into former National Security Adviser Michael Flynn’s connections with Russia."



http://www.rawstory.com/2017/05/comeys-approval-rating-lower-than-trumps-in-new-poll/