Joe Biden Calls For President Trump's Impeachment

In a campaign speech, Joe Biden expressed support for the impeachment inquiry against President Trump, citing Trump's actions as violations of his oath of office. The inquiry was initiated after Trump allegedly pressured Ukraine to investigate Biden and his son. Trump responded on Twitter, criticizing Biden and denying any wrongdoing. The White House announced it would not cooperate with the inquiry, labeling it as baseless and a Democratic attempt to overturn the 2016 election results.

What did Biden claim about Trump's actions in relation to the Constitution?

What was the basis for the formal impeachment inquiry into President Trump?