Joe Biden has yet to officially declare himself a candidate for the 2020 presidential election but those prospects could be compromised after former Nevada Democratic Assemblywoman Lucy Flores revealed that Biden of kissing the back of her head after sniffing her hair. Flores revealed, 

I felt him get closer to me from behind. He leaned further in and inhaled my hair. I was mortified. I thought to myself, 'I didn’t wash my hair today and the vice-president of the United States is smelling it. And also, what in the actual fuck? Why is the vice-president of the United States smelling my hair?' He proceeded to plant a big slow kiss on the back of my head. My brain couldn’t process what was happening. I was embarrassed. I was shocked. I was confused. There is a Spanish saying, 'tragame tierra,' it means, 'earth, swallow me whole.' I couldn’t move and I couldn’t say anything. I wanted nothing more than to get Biden away from me. My name was called and I was never happier to get on stage in front of an audience. 

A statement from the Biden camp came out not soon after, of course dismissing the claims as false. Bill Russo, Biden's spokesmen stated: 

"Neither then, nor in the years since, did he or the staff with him at the time have an inkling that Ms. Flores had been at any time uncomfortable, nor do they recall what she describes [...] But Vice President Biden believes that Ms. Flores has every right to share her own recollection and reflections, and that it is a change for better in our society that she has the opportunity to do so. He respects Ms. Flores as a strong and independent voice in our politics and wishes her only the best."

Source: complex.com