in iowa, biden denying any wrongdoing. >> mr. vice president, how many times have you ever spoken to your son about his overseas business dealings? >> i've never spoken to my son about his overseas business dealings. >> in the face of mounting calls for his impeachment, the president trying to flip the script to the bidens, insisting they are the ones who should be investigated. >> when you see the call you're going to be very surprised. joe biden is the one that did a very, very bad thing. joe biden, who is very dishones dishonest. >> the ukrainian foreign minister also weighed in on the call between presidents trump and zelinski. he would not get into the actual substance of it, he said there was no pressure from president trump for zelinski to do anything. if bret. >> bret: john, thank you, see you in new york tomorrow. the ukraine controversy is putting some congressional republicans and democrats in a tough spot. correspondent kristin fisher is on capitol hill with that part