Backers of President Donald Trump, some carrying guns, ramped up demonstrations on Thursday night against what he has baselessly called a rigged election, in battleground states where votes were still being counted.

The demonstrations were largely peaceful, although Trump supporters occasionally shouted with counterprotesters. Trump says the election is being stolen but there has been no evidence of fraud.

In Arizona, one of the closely-contested states in the too-close-to-call race between Trump and Democratic challenger Joe Biden, both sides of supporters briefly scuffled outside the Maricopa County Elections Department in Phoenix...