House Republicans may be moving full steam ahead with their impeachment inquiry into President Biden, but a GOP senator cautioned that the president might not be impeachable.
By the letter of the text, "bribery, treason, or high crimes and misdemeanors" are all things one does in office which betray the dignity of the position. "High crimes" means crimes done by those in a place of authority.
So no, whatever Hunter stuff from before the election they're trying to base the impeachment on would not be impeachable if you're trying to be Constitutional.
But, there's no one who can judge what counts as impeachable except the people who vote on it. They can really impeach/remove someone for whatever reason they want, they just need enough people to agree.