Tech entrepreneur Elon Musk, accused by civil rights groups of amplifying anti-Jewish hatred on his X social media platform, will meet Israeli President Isaac Herzog on Monday along with Israelis whose relatives have been held by Hamas in Gaza. Herzog’s office announced the meeting on Sunday night, saying, “In their meeting, the president will emphasize the need to act to combat rising anti-Semitism online.” Musk, a billionaire who also runs Tesla and SpaceX, did not respond to requests for comment through spokespeople for Tesla and X, formerly known as Twitter. Musk’s visit coincides with a four-day truce in an Israeli...