it is if you're suspected of laundering money or inflating your assets for a loan (bank fraud) or deflating them during tax time (tax fraud).
but there are other ways to detect that and one of the state investigations against him has those. so moot.

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no republican can defend the accusations so they attack the process.

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Right, the ends justify the means. Don't look at the shifty Schiff behind the curtain, the Republicans are required to chase after every leaked allegation he generates. If the case against Trump is so compelling, why are the hearings conducted in such an obviously prejudicial way? We get to see a 15 page witness opening statement but none of the cross examination that followed. Gee, that gives a full picture of the proceedings. The Democrats have perverted the impeachment inquiry into a grossly partisan spectacle but Republicans ought to ignore the shameful process but validate the ridiculous allegations it produces.

House majority leader Hakim Jefferies this morning promised the Democrat lynch mob would make a "presentation" of the so-called evidence public. We can only see the carefully distilled and massaged pap Resistance Democrats want to spoon feed the faithful.

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What is a 30 something year old single man with a rock in one hand and a Honduran flag in the other?

An asylum seeker.

Oh, I see.

So there is reason to "suspect" that Donald Trump is guilty of "laundering money" and/or "tax fraud"?

Got it...

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"In his second inaugural address, [Franklin D.] Roosevelt sought 'unimagined power' to enforce the 'proper subordination' of private power to public power. He got it…"—George Will, July 8, 2007

yes but that isn't the subject of this investigation.
this investigation is about campaign crimes.
it is an impeachable crime to ask a foreign country to get dirt on an opponent. whether that opponent is guilty or not of something makes no difference to whether Trump can be impeached for it.

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That's insane. As head of the Executive branch the POTUS is obligated to help with investigating potential criminal activity involving the administration of foreign aid by American officials such as the Vice President. Just because someone is running for the Presidency doesn't make them immune from investigation for coercing a foreign government to fire a prosecutor using US aid as a weapon to protect a family member.

The idea that Trump should be impeached for asking for an investigation into Biden's corruption is absurd.

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What is a 30 something year old single man with a rock in one hand and a Honduran flag in the other?

An asylum seeker.

Well, we now know what you believe...

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"In his second inaugural address, [Franklin D.] Roosevelt sought 'unimagined power' to enforce the 'proper subordination' of private power to public power. He got it…"—George Will, July 8, 2007

Wrong. A president has not only the authority, but the duty, to investigate allegations of abuse of power by current and previous government officials. Irregardless of their current status in the United States.