Everything you need to know about how winners are called, how states count ballots and Trump’s election denialism

There’s no simple answer as to when US voters will know the results of the midterms.

Elections are managed locally throughout the US, and it’s different in each state. Sometimes, if a race isn’t close, there’s a near-instantaneous sense of who won. In more contested races, it can take many hours, days or even weeks.

The administration’s efforts have raised concerns among experts about potential disruptions after election day

Donald Trump is waging a brazen effort to interfere with voting in this year’s midterm elections, escalating concerns that the federal government will try to slow down certification of election results – a strategy that could create chaos when the new Congress is seated next year.

Experts are certain the administration’s efforts to subvert America’s elections will not work. And some have bemoaned “fearmongering” about far-fetched scenarios that are unlikely to go anywhere in court.

Mary Peltola denies knowledge as party accused of recruiting spoiler candidate with same name as sitting Republican

• Alaska Senate race: what to know about Democrats’ alleged ballot-stacking effort

The top federal prosecutor in Alaska confirmed on Friday the existence of a criminal and a civil investigation into an alleged scheme by Democrats to confuse voters by recruiting a spoiler candidate on the ballot for US Senate who shares a name with the Republican incumbent, senator Dan Sullivan.

Speaking at a news conference in Anchorage on Friday, US attorney Michael Heyman cited reporting by the New York Times which suggested that the Senate campaign of Democrat Mary Peltola and national Democrats had, in his words, “orchestrated a sprawling conspiracy to recruit and prop up Daniel J Sullivan as a sham candidate”.