While House Republican leaders forge ahead with a vote Wednesday on a bill to push the Chinese owners of TikTok to divest or face being banned in the United States, the legislation is far from certain in the Senate.

Senators on both sides of the aisle are signaling they’re conflicted about the legislation amid concerns about constitutional rights to free expression, backlash from young voters in a critical election year, and now new opposition to the proposal from former President Donald Trump.