Lawmakers unveiled the latest iteration of a bill meant to crack down on boycotts of Israel and its West Bank settlements just in time for the pro-Israel lobby’s annual advocacy day on Capitol Hill.

Sen. Ben Cardin, D-Md., proposed an amendment to his Israel Anti-Boycott Act on Monday that he hopes will assuage concerns that the legislation violates free speech rights. The American Israel Public Affairs Committee (AIPAC) is championing the bill as part of its annual conference in Washington this week but some critics remain unconvinced by the changes.

Cardin told Al-Monitor that he’d had “several conversations” with the American Civil Liberties Union (ACLU) and taken its “input” after the group opposed his initial bill.  p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 15.0px 'Times New Roman'; -webkit-text-stroke: #000000} span.s1 {font-kerning: none} But while the ACLU approved of some of the changes, they still maintain that the latest iteration of the bill is unconstitutional.

“This bill is unconstitutional because it seeks to impose the government’s political views on Americans who choose to express themselves through boycotts,” said Ben Wizner, director of the ACLU Speech, Privacy, and Technology Project. “The proposed changes are improvements, but the revised bill continues to penalize participants in political boycotts in violation of the First Amendment. If it is enacted in this form and takes effect, we will strongly consider fighting it in court.”