Bauer pointed to a campaign finance law that prohibits foreign  nationals from providing "anything of value … in connection with" an  election. 
"The hacking of the Podesta emails, which were then transmitted  to Wikileaks for posting, clearly had value," Bauer noted, pointing to  Trump's frequent praise of the organization. "And its connection to the  election is not disputed."
Josh Douglas, an election and constitutional law expert who  teaches at the University of Kentucky Law School, also cited campaign  finance laws — specifically, the Bipartisan Campaign Reform Act of 2002,  also known as the McCain-Feingold act — when asked whether collusion  with a foreign power to win an election was illegal.
Like Bauer, he said the question would be whether any of  the Russian activity "would fall under that law as an expenditure," and  whether the Americans involved — in this case, the Trump campaign — had a  "specific intent to engage in that prohibited act." 
To Bauer, the intent seems clear:
"The President and others associated with the campaign made no  bones about the value to them of the purloined email communications. ...  He drew on the emails 
in the debates  with Secretary Clinton. Notably, when he was asked during the debates  to acknowledge the Russian program of interference and given the  opportunity to openly oppose the actions, he wouldn’t do so. He also  mentioned Wikileaks 
124 times  in the last month of the campaign. The Russians could only have been  strengthened in the conviction that their efforts were welcome and had  value. That covers the evidence in plain sight."