PHOENIX (AP) — Joe Biden and Donald Trump’s whirlwind agreement to meet for two presidential debates has upended the way the forums have been organized for nearly four decades. It sidelines and casts doubt on the future of the nonpartisan commission that has traditionally planned them. The presumptive Democratic and Republican nominees on Wednesday accepted debate invitations from CNN in June and ABC in September, shaking up the tradition of three debates not tied to a specific network and held in the weeks before the November election. Their plans came together rapidly, ending uncertainty about whether the candidates would debate.