Donald Trump's personal lawyer Michael Cohen has proved a ruthless and loyal friend but details of his personal finances are raising all sorts of eyebrows.

And Trump has accused the FBI of planting a spy inside his presidential campaign.

Two heavy hitters from the ABC's Washington bureau, Stephanie March and Conor Duffy, give us the low down.

This is a Trumpdate - your regular update on all things to do with the investigation.

Want to get in touch? Email: russia@abc.net.au.