The woman once described as Trump's 'right hand' is being investigated by Congress - here's who she is

One of President Donald Trump's closest personal assistants is about to be questioned by congressional investigators.

Though 64-year-old Rhona Graff has managed to stay out of the limelight for nearly 30 years of working at Trump Tower, she has remained the go-to source for high-profile officials who wanted to arrange a meeting with Trump outside his regular hours - and is now being questioned for potential knowledge on the administration's meetings with Russian officials.

Here's what is known about the assistant who has been setting up some of Trump's most private meetings for years: