House and Senate staffers signed an anonymous letter calling on Congress to protest or boycott Israeli Prime Minister Benjamin Netanyahu’s speech on Capitol Hill, citing concerns about the war in Gaza.

Organized by the Congressional Progressive Staff Association, the letter was signed by 230 employees from 122 Democratic and Republican congressional offices.

They emphasize that opposing Netanyahu’s joint address to Congress on Wednesday is “an issue of morality,” not politics.

“Citizens, students, and lawmakers across the country and the world have spoken out against the actions of Mr. Netanyahu in his War on Gaza,” the letter reads.

“Israelis have been protesting in the streets for months, decrying his failure to negotiate a ceasefire and release of hostages. We hope you will join your fellow Members of Congress in protest at his speech or in refusing to attend it.”

In May, congressional leaders invited Netanyahu “to share the Israeli government’s vision for defending democracy, combating terror, and establishing a just and lasting peace in the region.”

Some staffers have advocated a ceasefire between Israel and the Palestinian militant group Hamas, voicing their stance at demonstrations held in both November 2023 and May.

Numerous Democratic lawmakers have already announced their intentions to protest during Netanyahu’s speech.

Sen. Bernie Sanders (I-VT), one of the most vocal critics of this conflict, denounced leaders for inviting Netanyahu amid a conflict that has claimed over 38,000 Palestinian lives since Oct. 7, 2023, when Hamas attacked Israel, resulting in around 1,200 deaths and 250 hostages taken.

Last month, Sanders reiterated his decision to boycott the meeting, labeling Netanyahu a “war criminal.”

Netanyahu is scheduled to arrive in Washington next week for his speech.

He will also meet with President Joe Biden at the White House for the first time. His last meeting came in 2020 with then-President Donald Trump.

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The joint address will be the prime minister’s first since 2015, when 58 lawmakers refused to attend due to his opposition to the Iran nuclear deal under negotiation between Tehran and then-President Barack Obama.

The Biden administration is negotiating a ceasefire and seeking the release of approximately 120 remaining hostages held by Hamas in Gaza.