Captain Obvious is discussing:

Anchor Chris Wallace said on Thursday’s broadcast of Fox News Channel’s special coverage of the Senate impeachment trial that the House Democrats' articles of impeachment against President Donald Trump were a "serious issue" with a "troubling set of facts." | Clips

“You can argue that it wasn’t a crime,”

No you can't. There was no crime. There is no criminal charge. There is no arguing for and against those factual statements.

Further, the POTUS has an obligation to investigate corruption. And there is plenty of corruption to investigate - by the Bidens. Whether or not Biden is a candidate is a mute point. If evidence emerges of corruption (which it has - by Biden's own words, on camera), then it has to be investigated.