None of this absolves Trump from having his campaign managed by a Russian lobbyist. So two obvious possibilities - Trump is incompetent and didn't know this, Trump knew about this and is OK with having this type of ties to Russia.
Are you sure you aren't talking about Hillary's campaign manager?
"The FBI and Justice Department have launched an investigation into whether the Podesta Group, the lobbying and public relations firm co-founded by Hillary Clinton presidential campaign chairman John Podesta, has any connections to alleged corruption that occurred in the administration of former President of Ukraine Viktor Yanukovych."https://www.technocracy.news/index....roup-under-investigation-by-fbi-and-doj/