Tammy Murphy, New Jersey’s first lady, has ended her run for a U.S. Senate seat now held by the state’s embattled senior senator, Robert Menendez, she announced on Sunday in a video posted to social media.

Ms. Murphy said that she had concluded that continuing to compete in the Democratic primary against Representative Andy Kim, a third-term congressman from South Jersey, would mean waging a “very divisive and negative campaign.”

She was unwilling to do that, she said, and instead decided to suspend her campaign, effective immediately.

“With Donald Trump on the ballot and so much at stake in the nation, I will not in good conscience waste resources tearing down a fellow Democrat,” she said.

This is a developing story and will be updated.