By Patrick Howell O’Neill, Bloomberg News

WASHINGTON — As voters across the U.S. from New York City to New Jersey and Virginia to California prepare to cast ballots Tuesday, election officials are operating with sharply reduced support from a federal government agency that had previously helped states and localities counter bomb threats and cyberattacks.

The Cybersecurity and Infrastructure Security Agency has abandoned an Election Day situation room it had operated for years to share vital intelligence on physical and cyber threats with state and local authorities, said Paul Lux, chair of the Elections Infrastructure Information Sharing and Analysis Center, a national coalition of election officials.

CISA’s decision to end the information-sharing arrangement follows the dismantling of

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