Watch: "March for Israel" rally held at National Mall, Washington D.C.

Tens of thousands of Israel supporters are expected to rally on the National Mall on Tuesday to show support for the military campaign against Hamas, demand the immediate release of hostages held in Gaza and condemn an increase in antisemitic incidents across the nation and around the world.

The organizers, the Jewish Federations of North America and the Conference of Presidents of Major American Jewish Organizations, describe the effort as "an opportunity for all Americans to come together in solidarity with the people of Israel to demonstrate our commitment to America’s most important ally" in the region.

The Anti-Defamation League reported an immediate and alarming spike in antisemitic incidents across the U.S. in just the first two weeks of the Israel-Hamas war, which was triggered when Hamas militants slammed across the border Oct. 7 into Israel on a violent rampage. Preliminary data showed incidents of harassment, vandalism and assault increased by 400% during the period − Oct. 7-Oct. 23 − from the same period a year ago. Of the 312 incidents reported, 190 were "directly linked" to the war in Israel and Gaza, the group said.