When Elizabeth Proctor is arrested in Act II, Scene 4, John Proctor reacts vigorously.
First, he challenges Cheever aggressively. He asks what the evidence is and derides the relevance of the poppet. He pushes Mary Warren to admit that the poppet is hers. When Cheever arrests Elizabeth anyway, John goes so far as to rip up the warrant for her arrest.
Finally, after Elizabeth is gone, John tries to get Mary to testify that Abigail was the one who stuck the needle in the poppet. He goes so far as to start choking her when she refuses.