Following Sunday’s antisemitic attack in Boulder, Colo., on a group marching to raise awareness about the hostages held in Gaza, a bipartisan push is growing on Capitol Hill to designate the Muslim Brotherhood as a terrorist organization.

Mohamed Sabry Soliman, the assailant, an Egyptian citizen who lived in Kuwait for 17 years prior to arriving in the United States, appears to have expressed support for the group and Mohamed Morsi, the Muslim Brotherhood leader who previously served as Egypt’s president.

Law enforcement officials have not announced any further links between Soliman and the Muslim Brotherhood. Hamas is a Muslim Brotherhood affiliate, and the group is closely tied to Qatar.

Sen. Ted Cruz (R-TX) said on Tuesday that he plans to reintroduce a “modernized version” of the Muslim Brotherhood Terrorist Designation Act he previously led, adding, “the Muslim Brotherhood used the Biden administration to consolidate and deepen their influence, but the Trump administration and Republican Congress can no longer afford to avoid the threat they pose to Americans and American national security.”

The Washington Free Beacon first reported on Cruz’s efforts.

Rep. Jared Moskowitz (D-FL) separately wrote to President Donald Trump on Tuesday urging him to “conduct a comprehensive investigation” into designating the group as a foreign terrorist organization, noting that multiple U.S. allies and partners including Egypt, Saudi Arabia, the United Arab Emirates, Bahrain and Austria have already done so, and France is considering doing the same.

“It must be noted that such ideological influence not only fosters division but also encourages radicalization against the United States, our allies and the foundational principals that define our societies,” Moskowitz wrote. “Taking steps to investigate and designate the Muslim Brotherhood as an FTO would enhance the ability of U.S. law enforcement and intelligence agencies to disrupt financial networks and recruitment activities connected to its affiliates.”

The Muslim Brotherhood Designation Act backed by Cruz was first introduced in 2014 by former Rep. Michele Bachmann (R-MN). Cruz and Rep. Mario Diaz-Balart (R-FL) subsequently picked up the torch, reintroducing the bill in the subsequent four congressional sessions.

At its high-water mark, in 2016, the legislation picked up additional 71 co-sponsors, most of them Republicans, in the House, and seven in the Senate, and was reported out of the House Judiciary Committee by a 17-10 vote. When it was last introduced, the legislation picked up just 14 co-sponsors in the House and two in the Senate.

The bill as of 2021 would have directed the administration, within 60 days of passage, to assess whether the Muslim Brotherhood meets the criteria for designation as a foreign terrorist organization and to provide a “detailed justification” if it determines it does not.

Near the end of his first term, Trump was expected to designate the Muslim Brotherhood as a terrorist group but that move never materialized.

Rep. Randy Fine (R-FL), who on Monday told Jewish Insider that the Council on American-Islamic Relations should also be designated as a terrorist group, told JI on Tuesday that he had reached out to Cruz to offer to lead the Muslim Brotherhood legislation in the House.

“That’s really the nexus of all this,” Fine said, accusing the Muslim Brotherhood of funding CAIR, Students for Justice in Palestine and other anti-Israel groups. “None of what we’ve seen in America is organic … Look, if Saudi Arabia and the UAE don’t want them and Egypt doesn’t want them, maybe you ought to take a hint.”

He described CAIR as the “mouthpiece” of the Muslim Brotherhood in the United States and said that designating the Muslim Brotherhood would inevitably wrap in CAIR and SJP. CAIR’s leader met with members of the Muslim Brotherhood as recently as 2022, and has been linked to other Brotherhood-affiliated groups. CAIR has praised the Muslim Brotherhood as a moderating force with which the U.S. should engage.

SJP and its parent group, American Muslims for Palestine, have also been accused of having grown out of Muslim Brotherhood networks in the U.S.

Rep. Debbie Wasserman Schultz (D-FL) told JI she hasn’t been contacted about the effort to designate the group yet, “but I can think of no reason why I wouldn’t support that.” She added, “I am surprised — how has that not already happened?”