(CNN) Former Vice President Joe Biden said during an appearance on "Jimmy Kimmel Live!" Wednesday that "it's awful hard to avoid the conclusion" President Donald Trump committed "an impeachable offense" by pressuring the Ukrainian president to investigate Biden.

It was the furthest Biden has gone on the subject of Trump's impeachment -- which most of the other leading 2020 Democratic presidential contenders have called for.

Asked how the matter ranks on the "outlandish scale" of American politics, Biden said: "18 out of 10."

Biden's comments came the day the White House released a transcript of a July 25 call between Trump and Ukrainian President Volodymyr Zelensky in which Trump repeatedly pushed Zelensky to investigate Biden and his son, Hunter. There is no evidence of wrongdoing by either Joe or Hunter Biden.

Trump on Wednesday denied any wrongdoing, saying there was "no pressure whatsoever" in his phone call with Zelensky.

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