Talks about a potential plea deal are under way between federal prosecutors and an attorney for Lev Parnas, a Rudy Giuliani associate indicted for making illegal campaign donations who helped Trump lawyer Giuliani's search for dirt in Ukraine on Joe Biden, says an attorney familiar with the investigation

The talks appear to be in early stages, but the lawyer familiar with the investigation and ex-prosecutors say that pressure mounted on Parnas to cut a deal after prosecutors revealed on Monday that he and his business associate Igor Fruman, who was also indicted for making illegal campaign donations, are "likely" to face additional charges.

If Parnas strikes a deal it could put further legal pressure on Giuliani, who is facing a growing number of legal woes including some relating to his international consulting business as part of an investigation of alleged crimes including money laundering, wire fraud, campaign finance violations, making false statements, obstruction of justice, and violations of the Foreign Agents Registration Act.