MONTREAL — Ferrari and McLaren present a serious threat to Max Verstappen and Red Bull’s hopes of winning the Formula 1 world championship this year.

That’s the view of Red Bull team principal Christian Horner, who said Saturday ahead of the Canadian Grand Prix that the rival teams “absolutely” have the potential to dethrone Red Bull with more than half the season’s races still to come.

“There’s so many points on the board. They’re both great teams; you can’t write either of them…