Tens of millions of people fell for the “drain the swamp” metaphor Trump used in speeches. His solution was to establish term limits. But that only really changes the inhabitants of the swamp, not what causes it. The fluid that creates the swamp is the money used to lobby representatives, and donated to their campaigns. Note Trump did not call for any limitations on that. In fact, if you allow money to flow without any limits, and enact term limits, it actually gives those infusing the money more influence over elections and who inhabits the swamp. It’s always Republicans calling for term limits because Democrats seem to have a lock on certain seats.
During the primary debates, Trump bragged about giving money to candidates of both parties, and that when he went to them for something, he always got what he wanted. But millions of voters believed him when he said HE would drain the swamp; a swamp he helped create.