Washington (CNN) Newly released emails related to Donald Trump Jr.'s June 2016 meeting with a Russian lawyer to gather damaging information on Democratic presidential nominee Hillary Clinton ratchet up the possible legal liability for the President's son and other campaign operatives involved with the Russians last year.

The latest emails could relate most directly to federal campaign finance law barring the solicitation of any contribution or "thing of value" from foreign nationals.

Legal analysts also raise the possibility of perjury, for example, if Trump Jr. or anyone else involved earlier denied any Russian meeting to federal investigators. Anyone who made a false statement to federal investigators about the meeting, including a material omission on government personnel paperwork, could be in serious jeopardy. It is not clear that he has made any statements under oath related to the Russian interference in the election.

Some other critics of the administration, including Sen. Tim Kaine, a Virginia Democrat who was Clinton's running mate, have suggested the President's son might have engaged in treason by dealing with a foreign adversary -- but that is a possibility that many legal analysts reject.

Both Constitution and federal law covering treason provide the United States be actively at war with the foreign adversary for such a charge.

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