Sen. Tim Kaine, Hillary Clinton's former running mate, told multiple reporters Tuesday that Donald Trump Jr.'s meeting with a Russian attorney has amplified the Russia investigation to a potential treason investigation: "We're now beyond obstruction of justice in terms of what's being investigated, this is moving into perjury, false statements, and even potentially treason," he said.

Kaine emphasized that he is not on the Senate committees that are investigating Russian interference in the 2016 presidential election, and stated that his remarks are just an assessment.