Mostly, hard-right Republicans have been advocating for it, but I suspect a lot of labor (who has been raging against H-1B for a while) is happy with the policy of suspending H-1B visas, though quite dissatisfied with the politics, which is why you want hear any public support from them on it. (I favor abolition of H-1B as part of wider immigration reforms, but think that both the immigration suspension in general and the addition of various economic non-immigrant visas, including H-1B, to it in particular are bad policy, in the interest of disclosure.)