Washington (CNN) A Russian pro-democracy advocate says the controversial June 2016 Trump Tower meeting with a Russian lawyer -- who has since been reported to have close ties to the Kremlin -- shows the importance of the Magnitsky Act to the Putin regime.

"I think this Trump Tower meeting shows primarily how important the Magnitsky Act is to the Putin regime and how important weakening it, overturning it, potentially repealing it -- how much of a priority that is for the Kremlin," Vladimir Kara-Murza told David Axelrod on "The Axe Files," a podcast from the University of Chicago Institute of Politics and CNN.

"This meeting in Trump Tower in the summer of 2016 was just another illustration that they're ready to do any avenues, any methods to try to get to this goal, including using unofficial proxies," he said.

The act, signed into law in December 2012, blocks entry into the US and freezes the assets of certain Russian government officials and businessmen accused of human rights violations.

"The Magnitsky Act is seen by the Kremlin as the biggest threat," Kara-Murza explained. He said the restrictions were "terrifying" because there were "senior officials and the oligarchs in the Putin regime who have for years been stealing in Russia but spending in the West."

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