Federal Judge Denise Casper ruled that the president lacks the constitutional authority to impose electoral changes by decree.The decision nullifies one of the most controversial measures of his executive order on elections.

US federal court says the Trump-led initiative carries the risk of preventing valid voters from their constitutional right to democracy and tramples on Americans’ privacy.

A federal judge has ruled that a revamped federal tool that state election officials have used in their efforts to identify illegally registered noncitizen voters is unlawful and…