NYT (and DOJ Press Release here): 

The Trump administration said on Friday that the Justice Department will monitor polling sites in California and New Jersey ahead of the Nov. 4 election, amid requests by Republican Party officials in those states.

Although election monitoring by the Justice Department is not uncommon, it will likely heighten tensions as voters weigh in on some of the nation’s most closely watched races. President Trump has pushed the Justice Department to pursue parts of his agenda, including going after his political enemies, which has eroded its traditional independence. Mr. Trump also blamed his 2020 election loss on rigged voting, although there was no evidence of widespread voter fraud….

Shirley Weber, California’s secretary of state, said that the Justice Department provided no justification for deploying monitors “in what is a nonfederal special election.”