Washington( CNN) Former FBI Director James Comey now believes that President Donald Trump was trying to influence his judgment about the Russia probe, a person familiar with his thinking tells, but whether that influence amounts to obstruction of justice remains an open question.

Comey will testify publicly before the Senate intelligence committee after Memorial Day, the panel’s leaders announced Friday.

The central question at that blockbuster hearing will be whether Comey belief the President was trying to interfere with his investigation.