Bull. Biden is regarded as the strongest candidate and most likely to beat Trump. That makes him a rival. These word ga.es are just pathetic attempts excuse his behavior.
Hmmm out of ALL the corruption in Ukraine he just happens to ask them to announce an investigation on Biden.
It doesn't matter if Biden was (in July) the strongest anything. It was months away from the vote of the people. He was not Trump's rival, and may not be by the time of the primary election. Saying he would be and basing an impeachment on this fortune telling is what's one would call a phony excuse.
The first Thought Police impeachment in our history.
He does not have to be on the ticket yet to be a rival, political ads start up long before primaries. Again, it is a pathetic excuse for bad behavior.
Then that means every single runner for the nomination is off limits for the Republicans to look into extremely suspicious matters. Assuming Biden is going to be the nominee is not solid grounds to impeach a President on. And what will you say if they impeach Trump, and Sanders or Warren gets the nomination?
It's real simple: Biden is Trump's rival or he is not. If he is, for Democrats to make the case, cancel all future debates, and nominate him without the vote of their constituents. After all, they know it's going to be Biden anyway, so the voters won't get upset.