President Donald Trump has cancelled former Vice-President Kamala Harris' Secret Service detail, seven months after she left office following her unsuccessful presidential campaign.

By law, the US Secret Service provides former vice-presidents and their families six months of protection after their terms end.

That term, however, can be extended, which former President Joe Biden reportedly did before leaving office.

The move already has caused controversy, with both California Governor Gavin Newsom and Los Angeles Mayor Karen Bass calling it politically motivated.

Here's what we know.