Donald Trump’s idea to impose congressional term limits is one that has always made House and Senate lawmakers cringe, and one he’d find almost impossible to turn into a reality even if he does win the White House.

It’s a proposal that lawmakers know resonates with voters, who rate their approval for Congress in the low teens and single digits. But the vast majority of those serving in Congress despise the idea of capping how many years they can keep their jobs, and that opposition has kept the idea down since it was first rejected in 1789.