More specifically, let's consider Paul Manafort’s impeachment as an example of how House impeachments can prevent a corrupt President from pardoning his “Coadjutor corruptors.”
If the Democrats win the House, their power to make Trump unpardonable is probably enough to force a deal with Republicans in 2019– regardless of what the Senate does.
A NY Times analysis of the likelihood that a Democratic House would seek President Trump’s tax returns emphasizes that executive branch Trump appointees are expected to simply refuse to comply with demands for the returns from Congress.
Deputy Attorney General Rod Rosenstein's may resign or be fired later this week, in the wake of his reported comments and actions immediately following President Trump's decision last year to fire FBI Director James Comey.
Because Trump would be replaced by Mike Pence if he resigned or is impeached and removed, The Shadow President emerged as an important publishing event.
The only way I see the end of Trump is if there’s overwhelming evidence he rigged the 2016 election. In which case impeachment isn’t an adequate remedy. His presidency should be annulled.
“If the sitting president is accused of a crime, the Judiciary Committee in the House of Representatives would begin to look to see if there’s enough evidence to start investigating and drawing up articles of impeachment.”