Well you would want to wait until 2019 for that to happen if Dems get control of Congress as then the President and Congress get's to approve the replacement. In that above case it would be great to impeach both at the same time then the speaker of house which would be a Dem then take over.
Throw in DTJr, and Kushner too. Meanwhile .. To impeach or not to impeach: The Democrats’ new big rift
One year after Donald Trump's election, the Bernie vs. Hillary split has taken a backseat to the party's debate over pushing for the president's impeachment.
Why Jon Ossoff’s loss is bad news for Democrats’ 2018 hopes Updated by Jeff Stein Jun 20, 2017, 10:01pm EDT [...] But a basic fact of the race — which its Republican voting history doesn’t negate — is that this was a district that looked prepared to revolt against President Donald Trump. Hillary Clinton only lost the district by one point in 2016, and voters here supported Marco Rubio and Ted Cruz in the Republican primary. Ossoff was ahead in polling at times, and was supposed to benefit from an upsurge in turnout from an energized liberal voter base and massive canvassing operation. In the first round of voting this April, Ossoff came within a few points of clearing the 50 points he needed to avoid Tuesday’s runoff.
What the Georgia special election shows is that House and Senate Republicans still have powerful tools for beating back Democratic challengers, including appeals to an in-group identity and an avalanche of dark-money attack ads. [...] Handel successfully criticized Ossoff as “not one of us.” So will other Republicans https://www.vox.com/2017/6/20/15843864/jon-ossoff-special-election