So why didn't they? They impeached him for a phone call and an incendiary speech.
Not enough in the vaunted Mueller Report? (Which Mueller apparently didn't read. He didn't know what was in it.)
5. June 9, 2016 Meeting at Trump Tower
On June 9, 2016, senior representatives of the Trump Campaign met in Trump Tower with
a Russian attorney expecting to receive derogatory information about Hillary Clinton from the
Russian government. The meeting was proposed to Donald Trump Jr. in an email from Robert
Goldstone, at the request of his then-client Emin Agalarov, the son of Russian real-estate developer
Aras Agalarov. Goldstone relayed to Trump Jr. that the “Crown prosecutor of Russia . . . offered
to provide the Trump Campaign with some official documents and information that would
incriminate Hillary and her dealings with Russia” as “part of Russia and its government’s support
for Mr. Trump.” Trump Jr. immediately responded that “if it’s what you say I love it,” and arranged
the meeting through a series of emails and telephone calls.
https://www.justice.gov/archives/sco/file/1373816/download