Technically it would take 3/4 of the states to make a Constitutional change in addition to congressional action. I doubt that would happen honestly. An E.O. overreach on the other hand could be a possibility. Without getting into politics, Hillary has said that Australian style gun bans (read confiscation) are something she's 'look into'. Not being political, simply stating something she's said on the campaign trail. A university professor has already called for removing the 2A. These in and of themselves don't amount to much. But it is that 'slippery slope' concern that folks look at. It is a Socialist tactic, again not being political, simply stating fact. There ARE officials within the government that would very much like to see a disarmed population. Would they ever actually attempt it? Can't predict the future. But much 'media' on the subject is being force feed to a population that only looks at headlines and sound bites but doesn't know about history, socialism, actual statistics on crime and self defense etc.