My guess is that there will be proof of Trump campaign folks working in concert (although maybe marginally) w/ Russia and their cyber warfare attack of the US electoral process.
I will be shocked if there is any link to the President. But, the story and possible prosecution of his former team members will overshadow the legitimacy of his presidency.
But, the GOP will not seek to impeach him, as they are parasites.
The President's real exposure is whether he unwittingly or knowingly was part of the Russian oligarchs laundering money through Trump's business projects. That would explain the President's loyalty to Putin. If this is established, the President will have to resign or be impeached. Truly an epic game changer if true.
Assuming the President has no criminal or business ties to Putin or the Russian oligarchs, and hence, the only resulting storyline is that Trump campaign surrogates or members colluded with Russia re the cyber games, I still believe the President stays in office by . . . . . wait for it, . . . going as far left as he can (moderate to moderate left), to curry favor with the Democrats, who know they will have big time leverage over the President, and have a much safer path to retake the White House in 2020 w/ a tainted President Trump still in office.
Once "bought," one can always be bought again.