evidence: House Speaker Kevin McCarthy made several unproven claims Tuesday while announcing the opening of a formal impeachment inquiry into President Joe Biden. [...] Here’s a breakdown of some of the claims at the heart of the impeachment inquiry that McCarthy referenced on Tuesday. [...] In response to McCarthy launching the impeachment inquiry, Ian Sams, a spokesperson for the White House Counsel’s Office, said in a statement to CNN, "House Republicans have been investigating the President for 9 months, and they’ve turned up no evidence of wrongdoing. His own Republican members have said so. He vowed to hold a vote to open impeachment, now he flip flopped because he doesn’t have support. This is extreme politics at its worst."