( CNN) Donald Trump's Russia problem is getting worse — and more complicated.

Questions about his campaign's alleged ties to Moscow seem to proliferate by the hour. The mushroom cloud surrounding his baseless accusations that President obama wiretapped Trump Tower is spreading faster. The investigations have become difficult to keep track of — and those are just the ones we know about.

But the revelation on Thursday that fired former Trump national security consultant Michael Flynn, who also served as a top campaign aide, was offering his testimony to Congress in exchange for legal immunity signaled a potential turning point.

Watch: Flynn likened immunity to guilt in 2016

How did ‘pizzagate' inspire violence?

Source: Session was to ‘engage with' Russia