We end the season with the head of the investigation into Russian interference in the 2016 US presidential election - Robert Mueller.

He's been taking down key players, circling closer and closer to Donald Trump.

But can he finish before the President shuts him down?

This is our last deep dive into a key character in the Russia investigation for this season, but we'll keep you updated with Trumpdates every time an important development in the story breaks.

Keep an eye on your feed.

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