A single Republican state senator appears to be holding back a push by Donald J. Trump to net a potentially pivotal electoral vote even before ballots are cast.

Donald Trump believes he will win four electoral votes from Nebraska, but it’s the fifth one that he is increasingly fretting about – leading the former president and his Republican allies to mount a last-ditch effort to try and change state election law only weeks before ballots are cast.

Nebraska is one of two states that award some of its electoral votes by congressional district. A vote from the Omaha area is part of Harris’s easiest path to victory.